The entrance of an aerodrome gun tower is surrounded by wild flowers and grass in Kaohsiung, Taiwan, January 1, 2020. REUTERS/Ann Wang SEARCH "TAIWAN BUNKER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

An imam opens the door of an old mosque, known as Grande Mosquee, in Agadez, Niger October 29, 2019. REUTERS/ Zohra Bensemra

A European bison stands in a stable at the Royev Ruchey zoo in Krasnoyarsk, Russia August 12, 2019. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

A general view of the St. Patrick's Cathedral is seen with its Christmas illumination in Karachi, Pakistan December 22, 2018. REUTERS/Akhtar Soomro

Police tape is seen at the site of shooting in a restaurant in downtown Vienna, Austria December 21, 2018. REUTERS/Leonhard Foeger

A letter from Graham Brady, the chairman of the Conservative Party's 1922 Committee, states the result of the vote of confidence in Prime Minister Theresa May's leadership, in London, Britain December 12, 2018. Graham Brady handout via REUTERS

A letter from Graham Brady, the chairman of the Conservative Party's 1922 Committee, stating that the threshold of Members of the Parliament who have stated they no longer have confidence in Prime Minister Theresa May's leadership has been reached, is seen in London, Britain December 12, 2018. Graham Brady handout via REUTERS

The road sign for the city of Grasse is seen at the entrance of the town in Grasse, France, November 26, 2018. REUTERS/Eric Gaillard

Flames rise after a rocket attack in Sderot, near the Israeli side of the Israel-Gaza border, November 12, 2018. REUTERS/ Amir Cohen TPX IMAGES OF THE DAY

Engraved names of British and Commonwealth soldiers who died in World War One are seen at the Menin Gate Memorial in Ypres, ahead of Last Post ceremony marking the centenary of the end of World War One, Belgium November 8, 2018. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY

People take part in a procession up the hill of Tlachtga as part of the Flame of Samhain festival, in Athboy, Ireland, October 31, 2018. Samhain is believed to be the ancient precursor to Halloween and marks the end of the old Celtic year and the beginning of the new year where the spirits of the dead are passed onto the next world. REUTERS/Clodagh Kilcoyne

A flood level mark is seen as mud stains the entrance of a house after heavy rain and flash floods hit Campillos, southern Spain, October 21, 2018. REUTERS/Jon Nazca

A view of dry tree branches on the ground and the restoration works inside al-Zahir Baybars Mosque, an architectural landmark in old Cairo, Egypt October 16, 2018. Picture taken October 16, 2018. REUTERS/Amr Abdallah Dalsh

Locked metal gates of a house, built by villagers who work and live in Germany, are seen in the village of Gurgurnica, Macedonia June 8, 2018. Houses are closed during the year and used only several days during the summer. Picture taken June 8, 2018. REUTERS/Ognen Teofilovski

A sign protesting against a proposed housing estate hangs on an entrance to Garendon Park in Loughborough, Britain September 24, 2018. REUTERS/Darren Staples

Armenian Christian children attend a Sunday mass at the main Armenian Orthodox Church in Cairo, Egypt, September 16, 2018. Picture taken September 16, 2018. REUTERS/Amr Abdallah Dalsh

An Armenian Christian arrives to a Sunday mass at the main Armenian Orthodox Church in Cairo, Egypt, September 16, 2018. Picture taken September 16, 2018. REUTERS/Amr Abdallah Dalsh

A secluded beach is pictured ahead of the arrival of Hurricane Florence in Garden City Beach, South Carolina, U.S., September 11, 2018. REUTERS/Randall Hill

Migrants' possessions and furniture are seen on a farm where police evicted some 110 African migrants who had been living in stalls formerly used by cows, in Qormi, Malta August 13, 2018. REUTERS/Darrin Zammit Lupi

The sealed gate leading to a farm where police evicted some 110 African migrants who had been living in stalls formerly used by cows, is seen in Qormi, Malta August 13, 2018. REUTERS/Darrin Zammit Lupi

A cross can be seen at sunset atop of a Catholic church in Sydney, Australia, May 30, 2018. REUTERS/David Gray

Philippine Vice-President Leni Robredo talks to her supporters after filing a motion for reconsideration requesting the justices of the Supreme Court to reverse its earlier decision on the ballot shading threshold, at the Supreme Court in Padre Faura, Metro Manila, Philippines April 19, 2018. REUTERS/Romeo Ranoco

Philippine Vice-President Leni Robredo waves to her supporters after filing a motion for reconsideration requesting the justices of the Supreme Court to reverse its earlier decision on the ballot shading threshold, at the Supreme Court in Padre Faura, Metro Manila, Philippines April 19, 2018. REUTERS/Romeo Ranoco

Philippine Vice-President Leni Robredo gestures while filing a motion for reconsideration requesting the justices of the Supreme Court to reverse its earlier decision on the ballot shading threshold, at the Supreme Court in Padre Faura, Metro Manila, Philippines April 19, 2018. REUTERS/Romeo Ranoco

A horseshoe is seen hanging above the front door outside of the home of former Russian military intelligence officer Sergei Skripal, in Salisbury, Britain, March 6, 2018. Picture taken March 6, 2018. REUTERS/Toby Melville

The steel construction of the Schemerlbruecke bridge is seen in Vienna, Austria March 28, 2018. REUTERS/Heinz-Peter Bader

The steel construction of the Schemerlbruecke bridge is seen in Vienna, Austria March 28, 2018. REUTERS/Heinz-Peter Bader

A steady snow falls on the entrance to the West Wing at the White House in Washington, U.S. March 21, 2018. REUTERS/Jonathan Ernst

The door to 11 Downing Street, the official residence of Britain's Chancellor of the Exchequer, is seen in London, March 13, 2018. REUTERS/Toby Melville

A gateway leading to Thomas Jones' farm is blocked by heavy snow in Blessington, Ireland, March 5, 2018. REUTERS/Clodagh Kilcoyne

A gateway leading to Thomas Jones' farm is blocked by heavy snow in Blessington, Ireland, March 5, 2018. REUTERS/Clodagh Kilcoyne

People walk in the snow on Horse Guards Parade in London, February 28, 2018. REUTERS/Peter Nicholls

A frozen lake is seen in Elveden Forest, Suffolk, Britain, February 27, 2018. REUTERS/Paul Childs

A worshipper touches the closed doors of the Church of the Holy Sepulchre in Jerusalem's Old City February 27, 2018. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

A cave containing ancient paintings that show rows of figures standing on what look like skis, with herds of animals running below them, is seen on the outskirts of Altay, Xinjiang Uighur Autonomous Region, China, January 25, 2018. REUTERS/Jason Lee SEARCH "CHINA SKIING" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A dog is seen at the entrance of a house in the flooded residential area of Villeneuve-Saint-Georges, near Paris, France January 26, 2018. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY

An Israeli soldier stands next to an entrance to what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, on the Israeli side of the Gaza Strip border near Kissufim, Israel January 18, 2018. REUTERS/Jack Guez/Pool

An Israeli soldier stands next to an entrance to what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, on the Israeli side of the Gaza Strip border near Kissufim January 18, 2018. REUTERS/Jack Guez/Pool

An entrance to what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, is seen on the Israeli side of the Gaza Strip border near Kissufim January 18, 2018. REUTERS/Jack Guez/Pool

An entrance to what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, is seen on the Israeli side of the Gaza Strip border near Kissufim January 18, 2018. REUTERS/Jack Guez/Pool

An Israeli soldier enters what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, on the Israeli side of the Gaza Strip border near Kissufim January 18, 2018. REUTERS/Jack Guez/Pool

An Israeli soldier stands next to an entrance to what the Israeli military say is a cross-border attack tunnel dug from Gaza to Israel, on the Israeli side of the Gaza Strip border near Kissufim, January 18, 2018. REUTERS/Jack Guez/Pool

A long exposure shows a car driving past a military checkpoint which will be used for the upcoming World Economic Forum (WEF) beside the entrance of the Gotschnatunnel road tunnel near the Swiss mountain resort of Klosters, Switzerland, January 11, 2018. REUTERS/Arnd Wiegmann

Shattered glass and a sign reading "Ministry entrance" are seen at the lobby of the Labour Ministry after protesters from the communist-affiliated trade union PAME stormed the ministry during a demonstration against changes to laws about calling strikes in Athens, Greece, January 9, 2018. REUTERS/Alkis Konstantinidis

GENETICALLY MODIFIED COTTON PRODUCTIONPercentage of total cotton at or above the high-quality thresholdGM cotton as a percentage of total cotton acreage

GENETICALLY MODIFIED COTTON PRODUCTIONPercentage of total cotton at or above the high-quality thresholdGM cotton as a percentage of total cotton acreage

Lisa Bloodgood (R), a Brooklyn-based environmental advocate and former city council staffer, Franziska Landes, a Columbia University Environmental Sciences graduate student, and Sabina Gilioli (L), a Barnard College research assistant, help Reuters identify lead in backyards and public spaces in Brooklyn in New York City, U.S. September 14, 2017. The soil on a jogging path in McCarren Park in Williamsburg, Brooklyn revealed lead levels above a federal safety threshold. Picture taken September 14, 2017. To match Special Report USA-LEAD/NEW YORK REUTERS/Michael Pell

Afghan policemen try to rescue a child at the site of a suicide attack followed by a clash between Afghan forces and insurgents after an attack on a Shi'ite Muslim mosque in Kabul, Afghanistan, August 25, 2017. REUTERS/Omar Sobhani TPX IMAGES OF THE DAY

A religious believer carries a cross at the Graciousness Chapel in Altoetting, southern Germany August 23, 2017. REUTERS/Michael Dalder

The shadow of a displaced old woman is seen in Hassan Sham camp, east of Mosul, Iraq July 7,2017. REUTERS/ Alaa Al-Marjani TPX IMAGES OF THE DAY

The shadow of a displaced old woman is seen in Hassan Sham camp, east of Mosul, Iraq July 7,2017. REUTERS/ Alaa Al-Marjani

Bar chart and annotated chronology showing number of seats held by parties above or below majority threshold in House of Commons in the last 100 years

A worker passes a building, which is part of the old five-storey apartment blocks demolition project launched by the city authorities, in Moscow, Russia, May 16, 2017. REUTERS/Sergei Karpukhin

Church 'Wengenkirche' is pictured in Ulm, Germany, April 6, 2017. REUTERS/Michaela Rehle

Church 'Wengenkirche' is pictured in Ulm, Germany, April 6, 2017. REUTERS/Michaela Rehle

An exhumation site is seen in the village of El Mozote, Meanguera, El Salvador, December 10, 2016. REUTERS/Jose Cabezas SEARCH "CABEZAS MASSACRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.