The leader of an al-Qaida linked militia fighting to overthrow the Syrian government has vowed to take revenge for what he says was Damascus’ use of chemical weapons that killed hundreds of people.

Jabhat al-Nusra leader Abu Mohammed al-Golani’s comments came in an audio recording posted on Sunday on a militant website that usually carries al-Qaida and similar groups’ statements. It also appeared on the group’s Twitter and Facebook accounts.

The authenticity of the claim could not be immediately verified.

Al-Golani said he plans to target Shiite Muslim villages. President Bashar Assad’s regime is dominated by the Alawite minority, an offshoot of Shiite Islam.

Last Wednesday’s alleged chemical attack in a suburb of Damascus prompted U.S. naval forces to move closer to Syria as President Barack Obama considers a military response.

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