Air strikes kill at least 18 in Syria's Idlib - Observatory

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. REUTERS/Ammar Abdullah

BEIRUT (Reuters) - A suspected Syrian government chemical attack killed scores of people, including children, in the northwestern province of Idlib on Tuesday, a monitoring group, medics and rescue workers in the rebel-held area said.

The U.S. government believes the chemical agent sarin was used in the attack, a U.S. government source said, adding it was "almost certainly" carried out by forces loyal to Syrian President Bashar al-Assad.