Mattis says has no evidence of sarin gas used in Syria, but concerned

U.S. Secretary for Defense, Jim Mattis, sits opposite Britain's Secretary of State for Defence, Gavin Williamson, before a meeting at the Ministry of Defence (MoD) in central London, Britain November 10, 2017. REUTERS/Simon Dawson

WASHINGTON (Reuters) - U.S. Defence Secretary Jim Mattis said on Friday that while he does not have evidence of the nerve agent sarin being used by the Syrian government, the United States was looking into reports about its use and was concerned.

Mattis, speaking with reporters, said the Syrian government had repeatedly used chlorine as a weapon.