Group's success on battlefield and social media inspires offshoots to aid the caliphate's expansion.
The army reportedly has retaken nearly all of Benghazi from the extremist group Ansar al-Sharia.
An anti-government Islamist politician was pictured with the Ukrainian foreign minister in Kiev.
Images released on social media show a convoy of 4x4s flying jihadist flags in Benghazi.
Today's attack on a hotel frequented by Westerners marks a new development in ISIS's activity in Libya.
Damage to a plane is consistent with small-arms fire, officials say.
At least eight people, including five foreigners, were killed during an attack by gunmen against a luxury hotel in the Libyan capital of Tripoli.
The air strikes were on an airport controlled by a rival administration in the chaotic Libyan capital
A YouTube video shows a group from Misrata taking over the annex of the embassy
ISNA said the Revolutionary Guards had shot down the drone with a ground-to-air missile
How do we continue to do this kind of work when barbarians like ISIS reward us with kidnappings, beheadings, imprisonment and rape? asks Janine di Giovanni
A separate battle in the eastern city of Benghazi has complicated Libya's security
British embassy convoy attacked as fierce fighting between rival factions leads to foreign embassy evacuations
Al-Liby, whose real name is Nazih al-Ragye, was seized by U.S. forces in October in Libya and brought to the United States to face criminal charges
Security in the Libyan capital has deteriorated following two weeks of fighting
Libyan militia leader Ahmed Abu Khatallah was taken to a federal court in Washington from a Navy warship where he had been held since his June 15 capture
Qaddafi's forces systematically raped men and women during the uprising; the new government will recognize rape as a war crime
"It was America who urged Haftar to turn the country towards war and bloodshed," Mohamed Zahawi, head of the Benghazi brigade of Ansar al-Sharia said