US says signs Syria may be using chemical weapons, warns of quick response

The United States sees signs the Syrian government may be using chemical weapons, including an alleged chlorine attack on Sunday in northwest Syria, the State Department said on Tuesday, warning that Washington and its allies would respond "quickly and appropriately" if this were proven.

"Unfortunately, we continue to see signs that the Assad regime may be renewing its use of chemical weapons, including an alleged chlorine attack in northwest Syria on the morning of May 19," State Department spokeswoman Morgan Ortagus said in a statement.

"We are still gathering information on this incident, but we repeat our warning that if the Assad regime uses chemical weapons, the United States and our allies will respond quickly and appropriately," she said.