People hold balloons while walking at the crash site of the Malaysia Airlines flight MH17 plane on the fourth anniversary of the accident near the village of Hrabove (Grabovo) in Donetsk Region, Ukraine July 17, 2018. REUTERS/Alexander Ermochenko

People gather near a monument for the victims of the Malaysia Airlines flight MH17 plane crash to mark the fourth anniversary of the accident near the village of Hrabove (Grabovo) in Donetsk Region, Ukraine July 17, 2018. REUTERS/Alexander Ermochenko

A Malaysian air crash investigator inspects the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, Ukraine, July 22, 2014. REUTERS/Maxim Zmeyev/File Photo TPX IMAGES OF THE DAY

A pro-Russian separatist stands at the crash site of Malaysia Airlines flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, Ukraine, July 18, 2014. REUTERS/Maxim Zmeyev/File Photo

A Malaysian air crash investigator inspects the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, Ukraine, July 22, 2014. REUTERS/Maxim Zmeyev/File Photo

An armed pro-Russian separatist stands at a site of a Malaysia Airlines Boeing 777 plane crash in the settlement of Grabovo in the Donetsk region, July 17, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An armed pro-Russian separatist stands on part of the wreckage of the Malaysia Airlines Boeing 777 plane after it crashed near the settlement of Grabovo in the Donetsk region, July 17, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An armed pro-Russian separatist stands guard as monitors from the Organization for Security and Cooperation in Europe (OSCE) and a team of Malaysian air crash investigators inspect the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo), Donetsk region July 22, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight.. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

Malaysian air crash investigators take photos of the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo), Donetsk region July 22, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

George and Angela Dyczynski sit on a piece of wreckage of the downed Malaysia Airlines Flight MH17, during their visit to the crash site near the village of Hrabove (Grabovo), in Donetsk region July 26, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Sergei Karpukhin/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An 'Air' magazine is pictured at the site where the downed Malaysia Airlines flight MH17 crashed, near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine September 9, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Marko Djurica/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

A teddy bear is placed next to wreckage at the site of the downed Malaysia Airlines flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine September 9, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Marko Djurica/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

A part of the wreckage is seen at the crash site of the Malaysia Airlines Flight MH17 near the village of Hrabove (Grabovo), in the Donetsk region July 21, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

A pro-Russian separatist holds a stuffed toy found at the crash site of Malaysia Airlines flight MH17, near the settlement of Grabovo in the Donetsk region, July 18, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

A pro-Russian separatist stands at the crash site of Malaysia Airlines flight MH17, near the settlement of Grabovo in the Donetsk region, July 18, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An armed pro-Russian separatist stands on part of the wreckage of the Malaysia Airlines Boeing 777 plane after it crashed near the settlement of Grabovo in the Donetsk region, July 17, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An armed pro-Russian separatist stands at a site of a Malaysia Airlines Boeing 777 plane crash in the settlement of Grabovo in the Donetsk region, July 17, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

An armed pro-Russian separatist stands guard as monitors from the Organization for Security and Cooperation in Europe (OSCE) and a team of Malaysian air crash investigators inspect the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo), Donetsk region July 22, 2014. The Dutch are due to announce on Wednesday 28 September the long-awaited results of an investigation with Australia, Malaysia, Belgium and Ukraine into the July 17, 2014 downing of the flight.. REUTERS/Maxim Zmeyev/File Photo FROM THE FILES PACKAGE - SEARCH "FILES MH17" FOR ALL 20 IMAGES

A man rides his bicycle past the wreckage of the Malaysia Airlines Flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, in this December 15, 2014 file photo. Russia vetoed a United Nations Security Council draft resolution on July 29, 2015 that would have set up an international tribunal to prosecute those suspected of downing a Malaysia Airlines passenger airliner last year in eastern Ukraine. REUTERS/Maxim Shemetov/Files

A pro-Russian separatist standing at the crash site of Malaysia Airlines flight MH17, near the settlement of Grabovo in the Donetsk region, is seen in this July 18, 2014 file photo. Russia vetoed a United Nations Security Council draft resolution on July 29, 2015 that would have set up an international tribunal to prosecute those suspected of downing a Malaysia Airlines passenger airliner last year in eastern Ukraine. REUTERS/Maxim Zmeyev/Files

A wreath is placed on a cross with an inscription that reads "Save and protect" next to the site of the downed Malaysia Airlines flight MH17, near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine, July 14, 2015. Australia urged the United Nations Security Council on Tuesday to support the establishment of an international tribunal to prosecute those suspected of downing Malaysia Airlines jet MH17 in eastern Ukraine last year. REUTERS/Kazbek Basayev

Investigators work at the site of the MH17 Malaysia Airlines Boeing 777 plane crash near the village of Hrabove (Grabovo) in Donetsk region, April 16, 2015. REUTERS/Igor Tkachenko

Investigators work near a sign reading "No entrance! There may be remains of the victims of flight MH17 crash at the territory" at the site of the Malaysia Airlines Boeing 777 plane crash near the village of Hrabove (Grabovo) in Donetsk region, April 16, 2015. REUTERS/Igor Tkachenko

A man holds a stuffed toy found at the crash site of Malaysia Airlines Boeing 777 plane (flight MH17) near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine, December 16, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

Local workers transport wreckage from the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine, December 16, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

Local workers transport wreckage from the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine, December 16, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

Local workers transport wreckage from the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine, December 16, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

A sign reading "No entrance! There may be remains of the victims of flight MH17 crash at the territory" is seen at the site of the Malaysia Airlines Boeing 777 plane crash near the village of Hrabove (Grabovo) in Donetsk region, December 15, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

A dog stands at the site where MH17, a Malaysia Airlines Boeing 777 plane, crashed near the village of Hrabove (Grabovo) in Donetsk region, December 15, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: ANIMALS DISASTER POLITICS TRANSPORT)

Men walk past the wreckage of MH17, a Malaysia Airlines Boeing 777 plane, at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, December 15, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

A man rides his bicycle past the wreckage of MH17, a Malaysia Airlines Boeing 777 plane, at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, December 15, 2014. REUTERS/Maxim Shemetov (UKRAINE - Tags: DISASTER POLITICS TRANSPORT TPX IMAGES OF THE DAY)

Pro-Russian separatists ride on a truck near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: TRANSPORT CONFLICT MILITARY)

Pro-Russian separatists pose at checkpoint near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CONFLICT MILITARY)

An armored personnel carrier (APC) drives near the wreckage of Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT MILITARY)

A Pro-Russian separatist poses at a checkpoint near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CONFLICT MILITARY)

A pro-Russian armed man secures the crash site of the Malaysia Airlines flight MH17 near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT DISASTER)

A part from the wreckage of Malaysia Airlines flight MH17 is pictured at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT DISASTER)

A crane transports a piece of the Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT DISASTER)

Local workers work on the Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT DISASTER)

A crane transports a piece of the Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT DISASTER)

Local workers transport a piece of the Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: POLITICS TRANSPORT CONFLICT CIVIL UNREST TPX IMAGES OF THE DAY)

Local workers transport a piece of wreckage from Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: TRANSPORT POLITICS CONFLICT CIVIL UNREST)

Investigators look at a wheel from Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT POLITICS)

Investigators watch as a piece of wreckage from the Malaysia Airlines flight MH17 is transported at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST CONFLICT POLITICS TRANSPORT TPX IMAGES OF THE DAY)

Local workers look at a hole made by a piece of shrapnel on a Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT CONFLICT POLITICS)

A crane transports a piece of the Malaysia Airlines flight MH17 wreckage at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 20, 2014. REUTERS/Antonio Bronic (UKRAINE - Tags: CIVIL UNREST TRANSPORT POLITICS CONFLICT)

A truck transports wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) away from the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

A truck transports wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

A truck transports wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

A pro-Russian armed man secures crash site wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

Soft toys are seen near the crash site of the Malaysia Airlines Boeing 777 plane (flight MH17) near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

Local workers carry wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

A pro-Russian armed man secures crash site wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST)

Wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) is transported by a crane at the site of the plane crash near the settlement of Grabovo in the Donetsk region November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Antonio Bronic (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST TPX IMAGES OF THE DAY)

A pro-Russian separatist stands guard in front of debris at the site where the downed Malaysia Airlines flight MH17 crashed, near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

Dutch investigators and an Emergencies Ministry member work at the site where the downed Malaysia Airlines flight MH17 crashed, near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER POLITICS TRANSPORT TPX IMAGES OF THE DAY)

Local workers carry wreckage from the downed Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

A pro-Russian separatist stands guard next to a truck as a crane carries wreckage from the downed Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER POLITICS TRANSPORT)

Local workers transport wreckage of the Malaysia Airlines Boeing 777 plane (flight MH17) at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER TRANSPORT CIVIL UNREST TPX IMAGES OF THE DAY)

A pro-Russian separatist watches as a crane carries wreckage of the downed Malaysia Airlines flight MH17 at the site of the plane crash near the village of Hrabove (Grabovo) in Donetsk region, eastern Ukraine November 16, 2014. Local emergency services have begun collecting parts of the wreckage from its crash site in the middle of the conflict zone, Dutch air accident investigators said on Sunday. Dutch inspectors had hoped to collect the parts themselves, following the downing of the flight on July 17 that killed 298 people, two thirds of them Dutch citizens. But they remain concerned about the safety of their staff in the rebel-held conflict zone, and so have decided to work with local services following an initial focus on finding human remains and belongings. REUTERS/Maxim Zmeyev (UKRAINE - Tags: DISASTER POLITICS TRANSPORT TPX IMAGES OF THE DAY)