The hacking collective Anonymous is taking credit for an attack that disabled 40,000 Turkish websites, saying in a video posted to YouTube that it was retaliation for the country’s purported support of the Islamic State.

“As many of you have heard, Turkey is supporting Daesh by buying oil from them, and hospitalizing their fighters,” a representative of the group states in the video. “Daesh” is a pejorative Arabic term used to refer to the Islamic State.