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Policemen hold a motorcycle as one of their colleagues catches fire after being hit by a Molotov cocktail during a protest to mark the eight-month anniversary of the disappearance
Ayotzinapa students in Mexico City, May 26, 2015. REUTERS/Henry Romero

A dinghy overcrowded with Afghan and other immigrants is towed by a Greek coast guard patrol boat into the port on the Greek island of Kos following a rescue operation in a part of the Aegean Sea between Turkey and Greece, early May 26, 2015. Hundreds of mainly Syrian and Afghan immigrants on Tuesday landed on the Greek island of Kos in the south-eastern Aegean Sea. REUTERS/Yannis Behrakis

Rice is thrown as Hezbollah members of Lebanon surround the coffin of Hezbollah fighter Adnan Siblini, who was killed while fighting against insurgents in the Qalamoun region, during his funeral in al-Ghaziyeh village, southern Lebanon, May 26, 2015. REUTERS/Ali Hashisho

A protester sets up a barricade during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi, May 26, 2015. REUTERS/Goran Tomasevic

Protesters carry a protester who was according to them killed by policemen during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi, May 26, 2015. REUTERS/Goran Tomasevic

Flood waters cover Memorial Drive along Buffalo Bayou in Houston, Texas, May 26, 2015. Torrential rains have killed at least eight people in Texas and Oklahoma, including two in Houston where flooding turned streets into rivers and led to nearly 1,000 calls for help in the fourth-most populous U.S. city, officials said on Tuesday. REUTERS/Harris County Flood Control District

Human bones are seen near abandoned human trafficking camp in the jungle close the Thailand border at Bukit Wang Burma in northern Malaysia May 26, 2015. Malaysian police forensic teams, digging with hoes and shovels, began the grim task on Tuesday of exhuming the bodies of dozens of suspected victims of human traffickers found buried around jungle camps near the Thai border. REUTERS/Damir Sagolj

Sonia Porter (L) reacts to Devin Sadler, 9, picking up a waterlogged gun during clean-up efforts at the flood damaged home of John and Ruth Hansen in San Marcos, Texas, May 26, 2015. REUTERS/Tamir Kalifa

Rebel fighters from the Ahrar al-Sham Islamic Movement walk on a hill in Jabal al-Arbaeen, which overlooks the northern town of Ariha, one of the last government strongholds in the Idlib province May 26, 2015. REUTERS/Khalil Ashawi

Rebel fighters from the Ahrar al-Sham Islamic Movement take positions inside a building in Jabal al-Arbaeen, which overlooks the northern town of Ariha, one of the last government strongholds in the Idlib province May 26, 2015. REUTERS/Khalil Ashawi

Mexico President Enrique Pena Nieto and Brazil President Dilma Rousseff look up during a welcome ceremony at the National Palace in Mexico City, May 26, 2015. Rousseff is on a two-day visit to Mexico. REUTERS/Edgard Garrido

Visitors sitting in inflatable whirlpools watch a film during a whirlpool cinema event in Berlin, May 26, 2015. REUTERS/Stefanie Loos

A medic attends to people injured by a mortar shell blast during clashes between Houthis and fighters of the Popular Resistance Committees in southwestern city of Taiz in Yemen, May 26, 2015. REUTERS/Stringer

Hundreds of newly arrived immigrants walk towards a temporary shelter shortly after crossing the Aegean Sea early May 26, 2015. REUTERS/Yannis Behrakis

Cars and houses are seen covered by flood waters in southwest Houston, May 26, 2015. REUTERS/Daniel Kramer