The defeat of Isis in Mosul could spark “genocide” in Iraq as sectarian groups clash, a Shia leader has warned.

Muqtada al-Sadr, a powerful cleric, political figurehead and warlord, believes divisions between Sunni and Shia Muslims will worsen when Iraqis lack a common enemy.

“I'm afraid that the defeat of Daesh [Isis] is only the start of a new phase,” he told Middle East Eye.

“My proposal is inspired by fear of sectarian and ethnic conflict after Mosul's liberation,

“I want to avoid this. I am very proud of Iraq's diversity but my fear is that we may see a genocide of some ethnic or sectarian groups.”

Mr Sadr is calling for dialogue between Iraq’s Shia-led government and Sunni politicians, as well as Arab and Kurdish representatives to avoid new conflict.

He previously warned of a “dark future” for Iraq in an interview with The Independent in 2013, when he predicted that its people would “disintegrate” amid worsening sectarian hostility between Sunni and Shia Muslims.

Mr Sadr had little hope of tensions easing after decades of a “constant cycle of violence” seeing Saddam Hussein’s rule followed by the US invasion and then the rise of al-Qaeda in Iraq and its successor Isis, which frequently bombs Shia civilians.

It is staging a last stand in western Mosul - its last city stronghold in Iraq - after months of advances by international forces that face residential areas ridden with guerilla fighters and explosives.

Mr Sadr wants wants all militias, including his own anti-Isis Saraya al-Salam militia to be disbanded after their expected victory. It is the successor of Mr Sadr’s Mahdi Army, which he stood down in 2007 following alleged atrocities as the group fought against the US occupation of Iraq.

They are not among the groups fighting alongside Iraqi government forces, Kurdish Peshmerga and foreign allies to drive Isis out of the city of Mosul.

The most prominent militia is the predominantly Shia Popular Mobilisation Units (PMU), who were formally integrated into government forces in November but have been continually accused of war crimes against Sunni civilians.

Warlord: The rise of Muqtada al-Sadr Show all 7 1 /7 Warlord: The rise of Muqtada al-Sadr Warlord: The rise of Muqtada al-Sadr Muqtada al-Sadr: centre stage Reuters Warlord: The rise of Muqtada al-Sadr Sadr's followers show their support at a mosque in Kufa © Getty Images Warlord: The rise of Muqtada al-Sadr US viceroy Paul Bremer closed Muqtada al-Sadr's newspaper, al-Hawza, down for 60 days © AFP/Getty Images Warlord: The rise of Muqtada al-Sadr Residents in Najaf pass through a combat zone during sporadic fighting between Shiite militia and US troops © Getty Images Warlord: The rise of Muqtada al-Sadr Shiite Muslim men cut themselves with swords to mark the ritual of Ashura © AFP/Getty Images Warlord: The rise of Muqtada al-Sadr US commander General Ricardo Sanchez called US viceroy Paul Bremer to say: 'All hell is breaking loose with Muqtada' © AFP/Getty Images Warlord: The rise of Muqtada al-Sadr A car burns in an alleyway after being hit by American fire near the shrine of Imam Ali in Najaf © Getty Images

Troops from Britain, America and other members of the US-led coalition are also on the ground in Iraq, as well as militias backed by the Iranian government.

In a document detailing Mr Sadr’s proposal for peace, he demands Iraq “must request all invading and friendly forces to leave Iraq”, regardless of their affiliation.

His family were enemies of the Saddam regime, which assassinated his father and two brothers in 1999.

Mr Sadr was put under house arrest until the US invasion, which he then fought to oppose.

One battleground was Basra, where his Mahdi Army seized parts of the city from British forces in 2004 and forced the UK to withdraw in 2007 while battling in other parts of Iraq.

While still opposing all foreign intervention, Mr Sadr has now restyled himself as a peacemaker and politician, leading huge and occasionally violent anti-corruption protests in Baghdad.