Omar al-Hassi (C), the head of Libya’s self-declared Islamist-backed government is surrounded by soldiers flashing the sign of victory on December 11, 2014 west of Tripoli during a visit to forces loyal to his unrecognized administration.

Islamist militias in the eastern Libyan town of Derna say they have formed a new coalition ahead of an expected assault by pro-government forces.

“Everybody saw what happened in Benghazi: disaster; institutions destroyed; houses demolished; mosques and universities burned by the criminal hands of Haftar’s supporters,” said the newly formed Mujahedeen Shura Council.

Forces loyal to former general Khalifa Haftar and Abdullah al-Thini, Libya’s internationally recognized prime minister, are fighting to wrest full control of Tripoli and the eastern city of Benghazi from Islamist militants.

The Islamic State of Iraq and Syria (ISIS) group that has seized chunks of Iraq and Syria is thought to have gained a foothold in Derna amid the chaos in Libya since the 2011 uprising that ousted dictator Muammar Qaddafi.

In its statement issued late on Friday, the Mujahedeen Shura Council called on everyone in Derna to join the new coalition.

It also addressed Islamist fighters in Benghazi, saying: “We are with you in the war against the criminal Haftar and his soldiers”.

Ahead of the announcement, the Islamists staged a military parade in Derna, with tanks and combatants carrying black flags.

Since the 2011 uprising, Libya has been sliding deeper into crisis, torn by rival governments, parliaments and powerful militias, despite U.N. efforts to broker talks on ending the violence.

Western countries have been increasingly worried that the political turmoil could provide fertile ground for Islamic extremists.

A top U.S. military general said last week that the ISIS group has set up training camps in eastern Libya and that the American military is closely monitoring the situation.

Analysts say a number of factions in Derna have pledged loyalty to the ISIS group, but it remains unclear how much support they enjoy.

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