Summary
The United States is concerned about the potential use of sarin gas in Syria, U.S. Defense Secretary Jim Mattis said Friday, a day after Washington warned it was prepared to consider military action if necessary to deter chemical weapons attacks by the Syrian government.
Mattis, speaking with reporters, said the Syrian government had repeatedly used chlorine as a weapon.
In 2013, Syria said it would give up all of its chemical weapons.
U.S. officials have said the Syrian government may be also developing new types of chemical weapons.
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