The IS in Libya: Key Dates

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Key dates since the Islamic State group (IS) moved into Libya in 2014 amid the chaos that followed the ouster of Moammar Gadhafi in 2011.

On Monday, U.S. warplanes carried out their first air strikes on positions in the IS bastion of Sirte.

First jihadist attacks

- November 19, 2014: The U.S. says it is "concerned" by reports that radical extremists with avowed ties to IS are destabilizing eastern Libya, having already seized vast swathes of territory in Iraq and Syria.

- December 27, 2014: A car bomb claimed by IS explodes outside the diplomatic security building in Tripoli without causing casualties.

- January 27, 2015: IS claims an attack on Tripoli's luxury Corinthia Hotel that kills nine people, including five foreigners.

Since then IS has carried out multiple suicide attacks, including in February 2015 in al-Qoba, near the eastern town of Derna, that killed 44 people and in January 2016 at a police school in Zliten, east of Tripoli, which killed more than 50.

IS videos of killings

- February 15, 2015: IS releases a video showing the beheading of 21 Coptic Christians, all but one Egyptian, that it says was filmed in January. Egypt carries out air strikes on IS in its then stronghold of Derna.

- April 19, 2015: A new video shows the execution-style killing of 28 Christians originally from Ethiopia.

Sirte seized

- June 9, 2015: IS announces it has captured Sirte, hometown of Gadhafi, east of Tripoli.

- July 12, 2015: The group acknowledges it has been pushed out of Derna after weeks of fierce fighting with the town's Mujahedeen Council.

First U.S. strikes

- November 13, 2015: The U.S. bombs IS leaders in Libya for the first time and says it killed Abu Nabil, an Iraqi also known as Wissam Najm Abd Zayd al-Zubaydi. Libyan officials identify him as the IS chief in Derna.

- February 19, 2016: A U.S. air strike on a jihadist training camp near Sabratha, west of Tripoli, kills about 50 people.

- February 24, 2016: Some 200 jihadists briefly occupy central Sabratha, before being ousted by militias.

Offensive on Sirte

- March 30, 2016: The head of Libya's U.N.-backed unity government, Fayez al-Sarraj, arrives in Tripoli, despite the hostility of rival authorities.

- May 12, 2016: A vast offensive begins by forces loyal to the unity government to retake Sirte.

- June 4, 2016: Unity government forces say they have retaken a jihadist air base south of Sirte.

- June 9, 2016: Government forces enter the center of Sirte and besiege the jihadists.

- July 23, 2016: Loyalist forces say they have seized a building used by the IS to manufacture explosives.

- August 1, 2016: Sarraj says the U.S. has carried out air strikes on IS positions in Sirte for the first time, at the unity government's request.

- August 2, 2016: U.S. warplanes carry out second day of strikes on Sirte, as President Barack Obama says defeating the jihadists there is in America's interest.

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