BENGHAZI: Five people were killed and 12 wounded during clashes in eastern Libya between forces loyal to its internationally recognized government and Islamist groups, medics said Sunday.

Fighting broke out Saturday in the town of Ajdabiya, near the oil port of Brega, and a war plane attacked suspected Islamist positions to the south of the town, residents said.

It was unclear whether the Islamist fighters were affiliated to ISIS militants, who Friday attacked a checkpoint manned by troops loyal to the official government outside Ajdabiya, killing five soldiers.

Two more soldiers were killed when the government sent reinforcements, and another 15 have been missing since.

ISIS has exploited a growing security vacuum in Libya, where two administrations - each with its own government and parliament - are fighting for control four years after the toppling of Moammar Gadhafi.

The official prime minister has been based in the east since a rival group seized the capital Tripoli. He has been working with his cabinet from hotels in the city of Tobruk, about 270 km (167 miles) from Ajdabiya.

Both sides have several former anti-Gaddafi rebel groups fighting for them. After Gadhafi's ouster, the various factions split along political, regional and tribal lines.

Militants loyal to ISIS, the group which has seized much of Syria and Iraq, has taken over the central city of Sirte, to the west of Ajdabiya.