• A Syrian man collects and bags the body of a dead bird, reportedly killed by a suspected toxic gas attack in Khan Sheikhun, in Syria’s northwestern Idlib province, on April 5, 2017
  • Buildings in Hama, Syria
  • The program for chemical weapon destruction at Kizner facility, Udmurtia
  • Members of the Syrian Civil Defence, known as the White Helmets, take a selfie with their certificates after taking part in a training session in the rebel-held eastern Ghouta area, east of the capital Damascus, on November 22, 2016
  • The Pentagon, headquarters of the U.S. Department of Defense
  • A picture taken on April 4, 2017 shows destruction at a hospital in Khan Shaykhun in the northwestern Syrian Idlib province, following a suspected toxic gas attack.
  • The seal of the US Department of State
  • A civil defence member breathes through an oxygen mask, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017.
  • Russian Foreign Ministry building
  • A man carries the body of a dead child, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 4, 2017
  • Britain's Foreign Secretary, Boris Johnson, arrives in Downing Street, in central London, Britain June 15, 2017.
  • Damascenes greet personnel of the Syrian Arab Army that liberated the Kuwayres air base in the Aleppo Province
  • Civil defense members inspect the damage at a site hit by airstrikes on Tuesday, in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 5, 2017
  • A man breathes through an oxygen mask as another one receives treatments, after what rescue workers described as a suspected gas attack in the town of Khan Sheikhoun in Idlib, Syria April 4, 2017
  • Civil defense members inspect the damage at a site hit by airstrikes on Tuesday, in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 5, 2017
  • Civil defense members inspect the damage at a site hit by airstrikes on Tuesday, in the town of Khan Sheikhoun in rebel-held Idlib, Syria April 5, 2017
  • OPCW
  • Cars drive past the Russian Foreign Ministry building in Moscow on May 5, 2016.
  • DARPA
  • An underwater test-fire of strategic submarine ballistic missile is pictured in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on April 24, 2016.