WASHINGTON (Reuters) - Obama administration officials told lawmakers on a conference call on Thursday that they have "no doubt" chemical weapons were used in Syria and that Syrian President Bashar al-Assad's government had used them, U.S. Representative Eliot Engel, who participated in the call, told Reuters.

The senior administration officials cited evidence including "intercepted communications from high-level Syrian officials" and said they had seen personnel being moved around Damascus that indicated "it was ready for something big like a chemical attack," said Engel, the top Democrat on the House of Representatives Foreign Affairs Committee.

(Reporting by Patricia Zengerle; Editing by Mohammad Zargham)