A radio station used by ISIS to spread extremist ideology in one of the cities it conquered has been bombed out of operation, officials said Monday.

The Al-Bayan radio station was “one of the strongest” propaganda tools for the militants inside Mosul, a spokesman at Iraq’s Joint Operation Command told NBC News.

Broadcasting stopped Sunday after the station was bombed by Iraqi jets, the spokesman said.

Backed by U.S. forces, the country’s military is poised for an attempt to retake the city of 1.2 million, which was overrun by ISIS fighters in June 2014.