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A US air strike has targeted the leader of the Islamic State (IS) group in Libya and probably killed him, the Pentagon says.

Iraqi national Abu Nabil, also known as Wissam Najm Abd Zayd al-Zubaydi, was a "long-time al-Qaeda operative", it said.

The strike took place last Friday and targeted a compound in Derna.

The Pentagon said the strike showed that it would go after IS leaders "wherever they operate".

News agencies have quoted US officials saying they are confident Nabil was killed.

"Nabil's death will degrade Is's ability to meet the group's objectives in Libya, including recruiting new Isil members, establishing bases in Libya, and planning external attacks on the United States," Pentagon spokesman Peter Cook said, using a different name for the group.

He said the operation had been authorised before terrorist attacks in Paris at the weekend that IS claimed responsibility for.

Cook added that Nabil may have been the IS spokesperson pictured in a February 2015 video showing the apparent murder of Coptic Christians in Libya.

Libya remains in chaos four years after the overthrow of Muammar Qathafi, and is being fought over by a number of groups, including IS.

It has launched high-profile attacks in the mostly lawless North African country, and gained a foothold in key towns and cities, including Sirte.

The strike on Nabil was the first against an IS leader in Libya, the Pentagon said.

Reuters quoted an eyewitness who said the strikes occurred in areas controlled by IS militants in Derna's south-east suburb of Fattayah.