The United States is still assessing intelligence about last weekend’s suspected chemical weapons attack in Syria, U.S. Defense Secretary Jim Mattis said on Wednesday, Reuters reported.

Mattis, in some of his strongest comments on Syria to date, said he had been convinced of a chemical attack in Syria.

"I believe there was a chemical attack and we are looking for the actual evidence,” Mattis told lawmakers, adding he wanted inspectors in Syria “probably within the week.”