Two police stations were bombed early Sunday in the eastern Libyan city of Benghazi, a security official said, the second such attack in days that caused damages but no casualties, AFP reported.

"There were two new attacks today targeting al-Gwarcha and al-Uruba police stations, and both buildings have been lightly damaged," the official said on condition of anonymity.

On Friday bomb attacks targeted Ras Obeida and al-Madina police stations in Libya's second city causing extensive damage to the buildings and cars parked nearby.

The attacks are the latest signs of insecurity in Libya's second city, birthplace of the uprising that toppled the dictator Muammar Qaddafi in 2011.

Nearly two years after his fall, rebel groups that helped to overthrow him are still refusing to disband and remain a more visible presence on the streets than the state security forces.

"We are not satisfied with the performance of the Ministry of Interior," said Osama al-Sharif, Benghazi's local council spokesman told Reuters. "And especially with the leadership of Benghazi's police."

The recent violence against diplomats, military and police includes an attack in September that killed the U.S. ambassador and three other Americans.

This week, diplomats began to withdraw from the capital Tripoli, where security took a turn for the worse in late April when armed groups seized two ministries for about a fortnight to press demands on parliament.