Libyan forces renewed their push to oust Islamic State from its former North African stronghold of Sirte on Sunday, saying they had seized the city's main mosque and a jail run by the militants' morality police.

The forces, mainly brigades from the city of Misrata, say they are close to capturing Sirte after taking most of the city in a three-month campaign and restricting militants to a shrinking residential area in the city center. Since Aug. 1, they have been supported by U.S. airstrikes.

At least nine brigade fighters were killed and 85 wounded in Sunday's fighting, Misrata hospital spokesman Akram Gliwan said.