Iraqi forces on Thursday (July 6th) battled the last remaining "Islamic State of Iraq and Syria" (ISIS) fighters in Mosul's Old City, where the UN said up to 20,000 civilians are trapped and in "extreme danger".

The troops destroyed three ISIS pockets and killed 13 terrorists in three alleys inside al-Najfi neighbourhood, Iraq's Joint Operations Command spokesman Brig. Gen. Yahya Rasul told Diyaruna.

"Iraqi forces liberated al-Teen street and three alleys and keep advancing in al-Najfi," he said.

"About 200 civilians, mostly women and children, have been evacuated and immediate medical and food assistance has been provided to them," Rasul said.

However, as many as 20,000 civilians are still trapped in the Old City, UN humanitarian co-ordinator in Iraq Lise Grande told AFP.

"Our estimate at this stage is that in the final pockets of (Mosul's) Old City, there could be as many as 15,000 civilians, possibly even as high as 20,000," she said.

"They are in extreme danger from bombardment, from artillery crossfire. The (ISIS) fighters that are still there are still directly targeting civilians if they try and leave," Grande said.