Children raise a giant Armenian flag as they march in front of the Greek Parliament building during a demonstration in central Athens, April 24, 2015. Hundreds of Armenians marched to the Turkish embassy to commemorate the 100th anniversary of the mass killing of Armenians in the Ottoman Empire in 1915. REUTERS/Kostas Tsironis 

People attend a commemoration ceremony to mark the centenary of the mass killing of Armenians by Ottoman Turks at the Tsitsernakaberd Memorial Complex in Yerevan, Armenia, April 24, 2015. The Armenian Apostolic Church on Thursday made saints of up to 1.5 million Armenians at an open-air ceremony to commemorate their killing by Ottoman Turks a century ago. REUTERS/David Mdzinarishvili TPX IMAGES OF THE DAY

A woman cries in front of the skulls and bones of more than 8,000 victims of the Khmer Rouge regime during a Buddhist ceremony at Choeung Ek, a "Killing Fields" site located on the outskirts of Phnom Penh, April 17, 2015. Hundreds of Cambodians and monks gathered at the site to commemorate the 40th anniversary of the Khmer Rouge reign, which plunged the nation into a radical communist group genocide regime from 1975-1979. REUTERS/Samrang Pring TPX IMAGES OF THE DAY

A woman holds a rose as she prays during a memorial vigil following an attack by gunmen at the Garissa University College, at the "Freedom Corner" in Kenya's capital Nairobi April 7, 2015. Kenyan university students marched in the capital on Tuesday to demand more security from the government after gunmen killed nearly 150 people at a campus in the eastern town of Garissa last week. A citizens group planned to hold a vigil in Nairobi's main park later in the evening, tapping growing public frustration over security in the wake of the attack claimed by al Shabaab Islamists based in neighbouring Somalia. REUTERS/Goran Tomasevic 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH

A hand is seen as Iraqi forensic teams recovered dead bodies from a mass grave in the presidential compound of the former Iraqi president Saddam Hussein in Tikrit April 6, 2015. Iraqi forensic teams began on Monday excavating 12 suspected mass grave sites thought to hold the corpses of as many as 1,700 soldiers massacred last summer by Islamic State militants as they swept across northern Iraq. REUTERS/Stringer 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH

A hand is seen as Iraqi forensic teams recovered dead bodies from a mass grave in the presidential compound of the former Iraqi president Saddam Hussein in Tikrit April 6, 2015. Iraqi forensic teams began on Monday excavating 12 suspected mass grave sites thought to hold the corpses of as many as 1,700 soldiers massacred last summer by Islamic State militants as they swept across northern Iraq. REUTERS/Stringer 

A relative carries a picture of a student killed in Thursday's attack by gunmen, at the Chiromo Mortuary in Kenya's capital Nairobi April 6, 2015. The Kenyan air force has destroyed two al Shabaab camps in Somalia, it said on Monday, in the first major military response since the Islamist group massacred students at a Kenyan university last week. REUTERS/Thomas Mukoya

A relative is assisted by Kenya Red Cross staff as she reacts where bodies of the students killed in Thursday's attack by gunmen are preserved at the Chiromo Mortuary in the capital Nairobi April 5, 2015. The son of a Kenyan government official was one of the masked gunmen who killed nearly 150 people at a university last week, the interior ministry said on Sunday, as Kenyan churches hired armed guards to protect their Easter congregations. REUTERS/Gregory Olando 

A woman reacts during a ceremony for victims of the internal armed conflict, in El Rancho village, in the Quiche region, March 26, 2015. Guatemala's Forensic Anthropology Foundation (FAFG) this week delivered the remains of 81 skeletons found in a mass grave and who were killed in a massacre in the Estrella Polar village in March 22, 1982 during Guatemala's 1960-1996 civil war. Only the remains of 21 people were identified through DNA tests and returned to their families, while the other 60 unidentified remains were buried in unnamed graves, according to local media. Picture taken March 26, 2015. REUTERS/Jorge Dan Lopez TPX IMAGES OF THE DAY

Bullet holes pepper a wall where Muslims were executed in 1995 at an agricultural cooperative in Kravice near Bratunac, March 18, 2015. Serbia arrested eight men on Wednesday suspected of taking part in the 1995 Srebrenica massacre in Bosnia, the first such arrests in the ex-Yugoslav republic of accused gunmen in Europe's worst atrocity since World War Two. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CRIME LAW SOCIETY TPX IMAGES OF THE DAY CIVIL UNREST)

Fadila Efendic prays near memorial plaques at the Potocari genocide memorial centre near Srebrenica, March 18, 2015. Fadila lost her son and husband in the Srebrenica massacre. Serbia arrested eight men on Wednesday suspected of taking part in the 1995 Srebrenica massacre in Bosnia, the first such arrests in the ex-Yugoslav republic of accused gunmen in Europe's worst atrocity since World War Two.
REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: SOCIETY CIVIL UNREST TPX IMAGES OF THE DAY) 

Fadila Efendic touches the gravestones of her son and husband at the Potocari genocide memorial centre near Srebrenica, March 18, 2015. Fadila lost her son and husband in the massacre. Serbia arrested eight men on Wednesday suspected of taking part in the 1995 Srebrenica massacre in Bosnia, the first such arrests in the ex-Yugoslav republic of accused gunmen in Europe's worst atrocity since World War Two.
REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: SOCIETY CIVIL UNREST TPX IMAGES OF THE DAY) 

People attend a memorial rally to commemorate people from the so-called "Heavenly Sotnya" (Hundred) who were killed in anti-government protests in 2014, at Independence Square in Kiev February 20, 2015. Ukraine marked on Friday the first anniversary of pro-Moscow president Viktor Yanukovich's overthrow and the killings of 100 people protesting against his policy swerve away from Europe back to the old master, Russia. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: ANNIVERSARY POLITICS CIVIL UNREST)

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF DEATH
Human skulls are seen in a mass grave on the outskirts of the town of Sinjar, February 3, 2015. Police said the mass grave contained remains from 25 people belonging to the minority Yazidi sect, apparent victims of killings by Islamic State militants. REUTERS/Ari Jalal (IRAQ - Tags: CIVIL UNREST CONFLICT) 

People participate in a traditional ceremony to commemorate the victims of the 1932 Salvadoran peasant massacre, in the town of Izalco January 22, 2015. Indigenous residents of Izalco remembered the victims of the peasant rebellion of 1932, which was suppressed by then-President Maximiliano Hernandez Martinez. The massacre claimed the lives of anywhere between 10,000 and 40,000 peasants and other civilians, many of them indigenous people. REUTERS/Jose Cabezas (EL SALVADOR - Tags: SOCIETY POLITICS TPX IMAGES OF THE DAY) 

Grandmother (R) and mother of Muhammad Ali Khan, a student who was killed during an attack by Taliban gunmen on Army Public School, react during a visit by Imran Khan (L), chairman of Pakistan Tehrik-e-Insaf (PTI) political party, at the school in Peshawar December 22, 2014. Taliban gunmen broke into the school and opened fire last Tuesday, killing 132 students and nine staff members, witnesses said, in the bloodiest massacre the country has seen for years. REUTERS Fayaz Aziz (PAKISTAN - Tags: POLITICS CIVIL UNREST EDUCATION CRIME LAW TPX IMAGES OF THE DAY) 

A boy in an army uniform weeps for victims in front of Army Public School which was attacked by Taliban gunmen, in Peshawar December 19, 2014. At least 132 students and nine staff members were killed on Tuesday when Taliban gunmen broke into the school and opened fire, witnesses said. REUTERS/Fayaz Aziz (PAKISTAN - Tags: POLITICS CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY) 

A policeman collects blood samples as evidence on the auditorium floor at the Army Public School, which was attacked by Pakistan Taliban gunmen, in Peshawar December 18, 2014. Pakistan on Wednesday began burying 132 students killed in a grisly attack on their school by Taliban militants that has heaped pressure on the government to do more to tackle an increasingly aggressive Taliban insurgency. REUTERS/Fayaz Aziz (PAKISTAN - Tags: CRIME LAW CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY) 

A woman prays for Zulfiqar, 45, a teacher who survived an attack by Taliban gunmen on the Army Public School, as he lies on a hospital bed in Peshawar December 17, 2014. A shocked Pakistan on Wednesday began burying 132 students killed in a grisly attack on their school by Taliban militants that has heaped pressure on the government to do more to tackle the insurgency. REUTERS/Zohra Bensemra (PAKISTAN - Tags: CIVIL UNREST HEALTH CRIME LAW TPX IMAGES OF THE DAY) 

Shoes lie in blood on the auditorium floor at the Army Public School, which was attacked by Taliban gunmen, in Peshawar, December 17, 2014. At least 132 students and nine staff members were killed on Tuesday when Taliban gunmen broke into the school and opened fire, witnesses said, in the bloodiest massacre the country has seen for years. REUTERS/Fayaz Aziz (PAKISTAN - Tags: CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY) 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH
A mother mourns her son Mohammed Ali Khan, 15, a student who was killed during an attack by Taliban gunmen on the Army Public School, at her house in Peshawar December 16, 2014. Taliban gunmen in Pakistan took hundreds of students and teachers hostage on Tuesday in a school in the northwestern city of Peshawar, military officials said. REUTERS/Zohra Bensemra (PAKISTAN - Tags: CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY) 

Edith Mora Mora Venancio, sister of Alexander Mora Venancio mourns next to others women at their house in El Pericon, in the southern Mexican state of Guerrero, December 6, 2014. Forensics identified the remains of Alexander Mora Venancio, one of the 43 missing students of Ayotzinapa Teacher Training College Raul Isidro Burgos in September in Iguala, in the southern state of Guerrero, in a case that has shaken the government of the Mexican President Enrique Pena Nieto.
A source close to the investigation said on Saturday, apparently confirming a feared massacre the government has blamed on drug gang henchmen.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A woman (L) is comforted by another woman while carrying the shoes of her brother after identifying him as one among the seven men who had been shot during a middle school graduation party in the town of Acajutla November 25, 2014. Suspected gang members in El Salvador shot dead seven men and a woman early on Tuesday during a middle school graduation party in the Pacific seaport town of Acajutla, police said. At least four suspected members of local street gangs known as Maras broke into a house in the town southwest of the capital San Salvador and opened fire on the group without warning, police added. REUTERS/Jose Cabezas (EL SALVADOR - Tags: CRIME LAW CIVIL UNREST) 

Members of the community police of Guerrero (R) stand guard during a demonstration to demand justice for the 43 missing trainee teachers of the Ayotzinapa Teacher Training College Raul Isidro Burgos, in Tixtla, in the Mexican state of Guerrero, November 23, 2014. Embattled President Enrique Pena Nieto called on Mexico's states on Friday to swiftly adopt steps to modernize the justice system as he tries to defuse mass protests over the apparent massacre of 43 trainee teachers. Pena Nieto is facing the deepest crisis of his presidency after the students' abduction in late September by rogue police in league with drug gang members shone a light on chronic corruption and impunity.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST) 

Members of the Druze community watch the funeral of Israeli Druze police officer Zidan Nahad Seif in the northern village of Yanuh-Jat November 19, 2014. Two Palestinians armed with a meat cleaver and a gun killed four rabbis and a Druze police officer in a Jerusalem synagogue on Tuesday before being shot dead by police, the deadliest such incident in six years in the holy city. REUTERS/Baz Ratner (ISRAEL - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Jewish worshippers pray at a synagogue in Jerusalem where two Palestinian militants killed four rabbis and a policeman November 19, 2014. Two Palestinians armed with a meat cleaver and a gun killed five people in the Jerusalem synagogue on Tuesday before being shot dead by police, the deadliest such incident in six years in the holy city. REUTERS/Ronen Zvulun (JERUSALEM - Tags: CIVIL UNREST POLITICS RELIGION TPX IMAGES OF THE DAY) 

A bullet hole is seen in a door of a synagogue in Jerusalem where two Palestinian militants killed four rabbis and a policeman, November 19, 2014. Two Palestinians armed with a meat cleaver and a gun killed five people in the Jerusalem synagogue on Tuesday before being shot dead by police, the deadliest such incident in six years in the holy city. REUTERS/Ronen Zvulun (JERUSALEM - Tags: CIVIL UNREST POLITICS RELIGION TPX IMAGES OF THE DAY) 

A forensic geneticist takes a blood sample for DNA testing in the San Gerardo church in Iguala, Guerrero November 18, 2014. People with missing relatives provided blood samples to test if remains found in different mass graves around Iguala correspond to those of their missing relatives. The remains were found during the search for 43 students teachers of the Ayotzinapa Teacher Training College Raul Isidro Burgos, who have been missing since clashes with the police on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST) 

A woman fills in a form on her missing relative before giving a blood sample for DNA testing in the San Gerardo church in Iguala, Guerrero November 18, 2014. People with missing relatives provided blood samples to test if remains found in different mass graves around Iguala correspond to those of their missing relatives. The remains were found during the search for 43 students teachers of the Ayotzinapa Teacher Training College Raul Isidro Burgos, who have been missing since clashes with the police on September 26.
REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST) 

An Israeli police officer gestures as he holds a weapon near the scene of an attack at a Jerusalem synagogue November 18, 2014. Two suspected Palestinian men armed with axes and knives killed four people in a Jerusalem synagogue on Tuesday before being shot dead by police, Israeli police and emergency services said, the deadliest such attack in the city in years. REUTERS/Ronen Zvulun (JERUSALEM - Tags: CIVIL UNREST POLITICS TPX IMAGES OF THE DAY) 

Members of the Israeli Zaka emergency response team clean blood from the scene of an attack at a Jerusalem synagogue November 18, 2014. Two suspected Palestinian men armed with axes and knives killed four people in a Jerusalem synagogue on Tuesday before being shot dead by police, Israeli police and emergency services said, the deadliest such attack in the city in years. REUTERS/Ammar Awad (JERUSALEM - Tags: CIVIL UNREST POLITICS RELIGION TPX IMAGES OF THE DAY) 

Masked Palestinians hold axes and a gun as they celebrate with others an attack on a Jerusalem synagogue, in Rafah in the southern Gaza Strip November 18, 2014. Two Palestinians armed with a meat cleaver and a gun killed four people in a Jerusalem synagogue on Tuesday before being shot dead by police, the deadliest such incident in six years in the holy city amid a surge in religious conflict. REUTERS/Ibraheem Abu Mustafa (GAZA - Tags: POLITICS CIVIL UNREST) 

A group of protesters set fire to the wooden door of Mexican President Enrique Pena Nieto's ceremonial palace during a protest denouncing the apparent massacre of 43 trainee teachers, in the historic center of Mexico City late November 8, 2014. The group, carrying torches, broke away from what had been a mostly peaceful protest demanding justice for the students, who were abducted six weeks ago and apparently murdered and incinerated by corrupt police in league with drug gang members. REUTERS/Edgard Garrido (MEXICO - Tags: POLITICS CRIME LAW CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY) 

A man and his daughter hold a candle as the parents of the 43 missing students of the Ayotzinapa teachers' training college hold photos of their children during a protest at Zocalo square in Mexico City October 22, 2014. A Mexican mayor and his wife were "probable masterminds" behind the disappearance of 43 student teachers last month in the restive southwest, the country's attorney general said on Wednesday. The students went missing on Sept. 26 from Iguala in the southwestern state of Guerrero, after they clashed with police. The incident sent shockwaves across Mexico and undermined President Enrique Pena Nieto's claims that Mexico is getting safer under his watch. REUTERS/Tomas Bravo (MEXICO - Tags: CIVIL UNREST CRIME LAW POLITICS TPX IMAGES OF THE DAY) 

A Bosnian Muslim kneels near the coffin of a relative before a mass funeral for bodies found in a mass grave, in Kozarac, near Prijedor, July 19, 2014. The collective burial of 284 Bosnian Muslims and Croats, whose remains were found and identified in a northwestern mass grave and believed to be the largest from Bosnia's 1992-95 war, will take place on Sunday. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CONFLICT CIVIL UNREST POLITICS RELIGION) 

A Bosnian Muslim man prays during a mass funeral for 175 newly identified victims from the 1995 Srebrenica massacre, at Potocari Memorial Center, near Srebrenica July 11, 2014. Family members, foreign dignitaries and guests are expected to attend the ceremony on Friday marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by military commander Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of the 175 identified victims will be buried at a memorial cemetery during the ceremony, their bodies found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CIVIL UNREST CONFLICT OBITUARY) 

A Bosnian Muslim woman mourns near the coffin of a relative, one of 175 newly identified victims from the 1995 Srebrenica massacre, at Potocari Memorial Centre, near Srebrenica, July 11, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on Friday marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by military commander Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of the 175 identified victims will be buried at a memorial cemetery during the ceremony, their bodies found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CIVIL UNREST CONFLICT POLITICS) 

A Bosnian Muslim woman cries near the coffin of a relative, one of the 175 coffins of newly identified victims from the 1995 Srebrenica massacre, in Potocari Memorial Center, near Srebrenica, July 11, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on Friday marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by military commander Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of the 175 identified victims will be buried at a memorial cemetery during the ceremony, their bodies found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS CONFLICT ANNIVERSARY TPX IMAGES OF THE DAY OBITUARY) 

A Bosnian Muslim man cries near where 175 coffins of newly identified victims from the 1995 Srebrenica massacre are placed, in Potocari Memorial Center, near Srebrenica, July 10, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on July 11, marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of 175 identified victims will be buried at a memorial cemetery during the ceremony. Their bodies were found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS ANNIVERSARY SOCIETY CONFLICT OBITUARY) 

Part of an installation titled "Live from Srebrenica" by Bosnian Artist Mak Hubjer is seen in Potocari Memorial Center, near Srebrenica, July 10, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on July 11, marking the 19th anniversary of the 1995 Srebrenica massacre in which Bosnian Serb forces commanded by Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of 175 identified victims will be buried at a memorial cemetery during the ceremony. Their bodies were found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS ANNIVERSARY SOCIETY CONFLICT OBITUARY) 

A Bosnian Muslim woman cries near coffin of a relative, which is one of the 175 coffins of newly identified victims from the 1995 Srebrenica massacre, in Potocari Memorial Center, near Srebrenica, July 10, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on July 11, marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of 175 identified victims will be buried at a memorial cemetery during the ceremony. Their bodies were found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS CONFLICT ANNIVERSARY SOCIETY OBITUARY) 

A Bosnian woman mourns near a coffin of her relative, one of the 173 coffins of newly identified victims from the 1995 Srebrenica massacre, in the Potocari Memorial Center, near Srebrenica, July 9, 2014. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on July 11, marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of 173 identified victims will be buried at a memorial cemetery during the ceremony. Their bodies were found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS CONFLICT OBITUARY ANNIVERSARY) 

Bosnian women cry near a coffin of their relative, one of the 173 coffins of newly identified victims from the 1995 Srebrenica massacre, in the Potocari Memorial Center, near Srebrenica, July 9, 2014
. Family members, foreign dignitaries and guests are expected to attend a ceremony in Srebrenica on July 11, marking the 19th anniversary of the massacre in which Bosnian Serb forces commanded by Ratko Mladic killed up to 8,000 Muslim men and boys. The remains of 173 identified victims will be buried at a memorial cemetery during the ceremony. Their bodies were found in some 60 mass graves around the town. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: POLITICS CONFLICT OBITUARY ANNIVERSARY) 

A girl holding a flower crouches by the side of a road, as she waits with others for a truck carrying 173 coffins of newly identified victims of the 1995 Srebrenica massacre, in front of the presidential building in Sarajevo July 9, 2014. The bodies of the 173 recently identified victims of Srebrenica massacre will be transported to the memorial centre in Potocari where they will be buried on July 11, the anniversary of the massacre when Bosnian Serb forces slaughtered 8,000 Muslim men and boys and buried them in mass graves in Europe's worst massacre since World War Two. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CIVIL UNREST CONFLICT OBITUARY)