"Nine persons were killed and dozens wounded in a car bomb in Derna city" on Sunday night, a medical official in eastern Libya told AFP by telephone. "Some of the dead and wounded are civilians."
ISIS said it was behind the attack and that it was carried out by a Sudanese militant.
"The “martyr” Abu Jaafar al-Sudani blew up his car bomb... in the city of Derna, causing many dead and wounded," read a statement the group posted online.
The terrorist group's fighters last month lost control of Derna, which had been a bastion of ISIS since late last year. ISIS promised to avenge its fighters in a video posted online.
After the fall of Dictator Moamer Kadhafi in 2011, Libya now has two governments vying for power in the oil-rich country, one based in Tripoli in the west and another internationally recognized in Tobruk, to the east of Derna.