The unrecognized Libyan government is calling for widespread mobilization by the nation’s people against Islamic State fighters after a suicide attack on the city of Misrata in the northwest part of the nation killed five people and wounded eight others, the Agence France-Presse reported. ISIS claimed responsibility for the bombing, The Telegraph reported.

The attack was on a security checkpoint run by the Tripoli-based Fajr Libya or Libya Dawn, the militia group that was installed into power last year but lacks the recognition of the international community. ISIS has sought to systematically take over Libya, which remains divided by its own internal wars and divisions.

In writing on Facebook, ISIS warned that the attacks were not over. "The apostates of Fajr Libya... must know that a war is coming to cleanse the land of their filth unless they repent and go back to their true religion," said the extremist group, according to AFP.

The attack on Sunday was one of a string of suicide bombers to target security checkpoints in the northwest part of the nation. This one caught forces off guard, driving a 4x4 from the opposite direction of most attacks in the darkness of 4 a.m., The Independent reported.

ISIS worked to exploit the divisions between two factions who are fighting for control of Libya. The oil-rich nation provides appeal to ISIS, who has used the bountiful oil fields in Iraq and Syria to fund their operations.

The acting prime minister of the Tripoli government, Mohammed Khalifa al-Guwail, read a statement on television in response to the attack. "The Tripoli government is determined to continue fighting extremism and criminal gangs who operate under what is known as the Islamic State until they are uprooted," the statement said, according to The Daily Mail. He urged all with military backgrounds to mobilize against ISIS.

The rival prime minister to al-Guwail who was run out of Tripoli last year, Khalifa Ghwell also vowed to fight ISIS.

"We will support all army, police and revolutionary forces to fight and chase those apostates who have come to Libya claiming they are representing Islam," Ghwell told Reuters.