BEIRUT, April 13 (Reuters) – Syrian President Bashar al-Assad said an alleged poison gas attack blamed on his government last week in Idlib province was “100 percent fabrication” used to justify a U.S. air strike, news agency AFP reported on Thursday.

Syria’s military had given up all its chemical weapons in 2013 after an agreement made at the time, and would not have used them anyway, AFP quoted Assad as saying in an interview. The United States and its allies say the Syrian military carried out the Idlib attack, something Syria has already denied.

The April 4 attack in the town of Khan Sheikhoun killed scores of people and prompted the United States to launch a cruise missile strike on a Syrian air base in response, its first direct assault on the Assad government in the six-year-old conflict.

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