ISIS terrorists (file)
ISIS terrorists (file) Reuters

Islamic State terrorists reentered the Syrian Kurdish battleground town of Kobane on Thursday, detonating a suicide bomb and battling Kurdish forces, a monitoring group said, according to AFP. 

"ISIS detonated a suicide bomb in the area near the border crossing with Turkey, killing at least five people," said Syrian Observatory for Human Rights director Rami Abdel Rahman.

"Fierce clashes erupted afterwards in the centre of the town and there are bodies lying in the streets," he added, without giving a specific toll.

He said fighting was still raging on Thursday morning.

ISIS battled for some four months to seize Kobane but Kurdish fighters backed by US-led air strikes secured control of the border town in January in a symbolic defeat for the jihadists.

The terror group which controls large swathes of territory in both Iraq and Syria also made other strides in Syria on Thursday, the Observatory said. 

Overnight Wednesday ISIS terrorists entered the northeastern Syrian city of Hasakeh, seizing two neighborhoods from government forces in heavy clashes. 

At least 30 regime loyalists and 20 IS jihadists were killed in the fighting, which continued into Thursday morning. 

"Heavy fighting is continuing, with shelling by both sides," Observatory director Rami Abdel Rahman said. "Civilians in those areas and nearby are fleeing to the northern parts of the city. 

Control of Hasakeh, a provincial capital, is divided between Kurdish militia and government loyalists.

ISIS has sought repeatedly to enter Hasakeh, including earlier this month when it advanced to the southern outskirts of the city before regime forces pushed it back in heavy fighting.