AN ISIS suicide bomber killed himself and 12 other terrorists when his explosive belt accidentally went off at his goodbye party, a top cop said.

Police chief Jassem al-Saadi said 12 Islamic State terrorists northeast of the city of Baqubah were bidding farewell to a moronic militant who was about to launch a suicide attack.

4 The terrorist's suicide bomb went off at his own farewell party. File picture Credit: AFP-Getty

4 An Islamic State suicide bomber attacks Iraqi special forces soldiers with a car bomb during clashes in Mosul Credit: Reuters

Saadi said told Iraqi News that the devastating weapon on the bomber’s body detonated and killed his murderous well-wishers instead.

ISIS jihadis often hold a sickening "blood party" for those who are about to launch a suicide bomb attack.

The terror group has launched a series of desperate attacks as it loses ground in Iraq.

4 Smoke rises at Tercille village near Mosul following an ISIS suicide car bomb attack Credit: Getty Images

Iraqi forces today pushed towards the river side of Mosul's Old City, their key target in the eight-month campaign to capture Islamic State's de-facto capital.

The Iraqi military, battling up to 350 militants dug in among civilians in the Old City, said federal police had dislodged ISIS insurgents from the Ziwani mosque and were only a few days away from ousting militants completely from the Old City.

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"The victory announcement will come in a very short time," Prime Minister Haider al-Abadi said on his website last night.

"The operation is continuing to free the remaining parts of the Old City," Lieutenant General Abdul-Wahab al-Saadi of the Counter Terrorism Service (CTS) told a Reuters correspondent near the frontline in the heart of the Old City.

4 Iraqis look on as they inspect the site of suicide car bomb attack in the Karada district of central Baghdad Credit: EPA

The fall of Mosul would mark the end of the Iraqi half of the "caliphate" proclaimed by Islamic State though the militant group remains in control of large areas of both Iraq and Syria.

In Syria, the Islamic State-held city of Raqqa is nearly encircled by a US-backed, Kurdish-led coalition.

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