At least 65 people were killed today when one of Libya's worst truck bombs in years exploded at a police training centre in the town of Zliten, local officials and hospital sources said.
No group immediately claimed the attack, but the bombing was one of the deadliest since Islamist militants started expanding their presence in the chaos that followed the fall of Muammar Gaddafi in 2011.
Mayor Miftah Hamadi said the bomb, at 8am, detonated as recruits were gathering for training at the police centre in Zliten, a coastal town between the capital Tripoli and the port of Misrata.
Witnesses said residents were ferrying victims to Misrata hospitals in ambulances and cars, many with shrapnel wounds. Medical sources said 65 people had been killed, including some civilians, though one official said between 50 and 60 had died.
Other sources said that more than 100 people were dead. The Misurata Central Hospital said 50 wounded had arrived at the hospital.
Since the NATO-backed revolt ousted Gaddafi, Libya has slipped deeper into turmoil with two rival governments and a range of armed factions locked in a struggle for control of the North African state and its oil wealth.
In the chaos, Islamic State militants have grown in strength, taking over the city of Sirte and launching attacks on oilfields. Islamic State fighters this week attacked two major oil export terminals.
In February last year, three car bombs hit the eastern Libyan city of Qubbah, killing 40 people in what officials described as a revenge attack for Egyptian air strikes on Islamist militant targets.
Western powers are pushing Libya's factions to back a UN-brokered national unity government to join forces against Islamic State, but the agreement faces major resistance from several factions on the ground.
Explosion rocks Derna
Another explosion rocked Derna in the east at the main entrance of Nahda School. There were no casualties.
The school is used as headquarters for the fundamental Derna Mujahideen Shura Council.
Federica Mogherini condemns attacks
In a statement, European Commission vice-president Federica Mogherini said Libyans deserved peace and security, and, with the Libyan Political Agreement, they had a great opportunity to set aside their divisions and work together, united, against the terrorist threat facing their country.
"The quick implementation of the Libyan Political Agreement will be instrumental, so that a government of national accord can be established as soon as possible, to defend all Libyan citizens.
"It will also help preserve Libya's resources, defeat terrorists that want to undermine Libya's prosperity, and restore stability and security throughout the country," she said.