TRIPOLI: A suicide car bomber rammed his vehicle into the outer gate of the headquarters of the internationally recognized Parliament, a Libyan lawmaker and a security official said.

Parliamentarian Abu Bakr Baeira said no one was killed in the attack in the eastern city of Tobruk, where the assembly has been forced to convene since radical militias seized the capital Tripoli over the summer and revived a rival government. A security official said 18 people were lightly injured including a lawmaker and three children. He spoke on condition of anonymity because he was not authorized to speak to the press.

No one claimed responsibility for the bombing. Officials have blamed previous attacks on extremists based in the eastern town of Darna, who have pledged allegiance to the Islamic State group.

Meanwhile, a Libyan jet shot down a militia helicopter Tuesday after radical fighters launched airstrikes on a key oil terminal in the east of the country, a military spokesman said.

Fighters from the Fajr Libya (Libya Dawn) coalition of militias, which controls much of Tripoli, as well as second and third cities Benghazi and Misrata, have been trying to seize Al-Sidra oil terminal.

Militia aircraft, including the helicopter, attacked pro-government forces deployed in the so-called “oil crescent” eastern region around Al-Sidra, said spokesman Ali Al-Hassi.

“The air force shot down the helicopter as it prepared to land at a military base near Sirte airport, after it had taken part with other aircraft in the air raids,” Hassi said.

Seven oil tanks at Al-Sidra were set on fire as a result of the fighting. On Sunday, firefighters managed to extinguish the blazes at four of them and another was tacked Monday, leaving two tanks still ablaze.

On Monday, Libya’s internationally recognized government approved a $6 million deal with a US firm that will send experts to extinguish the fires in Al-Sidra, a statement said.