Photo: Zahra Moloo/IRIN

An assortment of ammunition (file photo).

An explosion at a Benghazi police station injured up to five Libyan policemen on Wednesday (December 12th), Libya Herald reported.

"The bomb went off as a police vehicle passed in front of the Al-Fwihet station," police officer Adel Jibril told AFP. "Two traffic policemen inside the vehicle were seriously wounded," along with two police officers who were posted outside the station, he added.

The explosion left a large crater in front of the station and partly damaged the building's facade.

Jibril said preliminary investigations suggested the blast was caused by a suitcase full of explosives.

"We still do not know if the bomb was placed in front of the station or in the car," he continued.

The cause of the blast remains unclear. According to Libya Herald, the explosion was caused by someone firing a rocket at the station.

On September 11th, the US consulate in Benghazi was the target of an attack - attributed to Islamist extremists - that killed four Americans, including Ambassador Chris Stevens.