US President Donald Trump and Russian President Vladimir Putin have agreed to press for a ceasefire to halt the war in Syria.
The two spoke by telephone for the first time since the US launched air strikes against Syria nearly a month ago, straining relations.
White House and Kremlin statements suggested a productive conversation.
Other topics discussed included North Korea and the timing of a future face-to-face meeting.
Syrian President Bashar al-Assad said the incident was untrue.
However in a statement earlier Mr Putin called for a full investigation into the incident and condemned any use of chemical weapons.