"Make their blood flow as rivers” – IS Leader Urge Followers

In a recent video message, al Baghdadi expresses confidence in victory and urges his fighters to be resilient and steadfast.

The leader of the Islamic State group has urged his followers in Mosul to keep up the fight against Iraqi forces and "make their blood flow as rivers".

The message purporting to be from Abu Bakr al Baghdadi came in a 30-minute audio recording, according to the SITE Intelligence Group, a US organisation that monitors militant activity online.

The authenticity of the recording could not be verified.

He also calls for attacks in Saudi Arabia and Turkey.

"This raging battle and total war, and the great jihad that the state of Islam is fighting today only increases our firm belief, God willing, and our conviction that all this is a prelude to victory," he said.

"Turn the nights of the unbelievers into days, wreak havoc in their land and make their blood flow as rivers," he told his fighters.

In a previous recording released in December last year, he reassured his followers that airstrikes by the US and others in Syria had not weakened the group.

The latest recording is his first public message to supporters since US-backed Iraqi and Kurdish forces launched the battle to retake Mosul, Iraq's second-largest city and last major IS stronghold in the country.

The battle, which started on 17 October, is shaping up as the largest in Iraq since the US-led invasion of 2003.

 The city of more than one million people and its surrounding territory fell to IS fighters during a surprise attack in June 2014. 

IS has put up fierce resistance, sending suicide trucks against advancing troops and leaving booby traps and explosives on the road as they retreat.