Islamic State militants attacked a prison in Syria's al-Hasaka in an attempt to free prisoners belonging to the group who had mutinied, the Kurdish-led Syrian Democratic Forces (SDF) said in a statement on Thursday.
Islamic State "sleeper cells ... infiltrated from the surrounding neighbourhoods and clashed with the internal Security Forces," the U.S.-backed group added.
The SDF, which is spearheaded by the Kurdish YPG militia, said its forces thwarted the escape attempt by prisoners that coincided with a car bomb that was detonated near the prison by militants, spokesman Farhad Shami said in a tweet.
