Baghdad, March 26 (IANS): Some of Iraq's Shia militias have withdrawn from the offensive aimed at freeing Tikrit in protest against the participation of US-led coalition airstrikes, an Iraqi Shia militia group said on Thursday.

Saraya al-Salam, or Peace Brigades, loyal to Shia cleric Moqtada al-Sadr, said in a statement that they will not participate in liberating the Iraqi cities and towns held by the Islamic State (IS) militant group with the presence of US-led coalition airstrikes, considering that the militias are capable of liberating the land and that the US presence is to "confiscate the victories" of Iraqis, Xinhua reported.

"The Saraya al-Salam announces withdrawal from any operation to free the cities of Iraq with the presence of US shameless intervention," it said.

Another Shia militia Ahl al-Haq Movement said it will not participate in a battle with the presence of international coalition saying the Iraqi security forces and Hashid al-Shaabi, or Popular Mobilisation, are capable of liberating the Iraqi IS-held cities.

"We will not participate in any battle conducted by the United States, whether their presence was by air or by land. We reject to get involved into any battle in which the international coalition will be there," a statement by the group quoted its spokesperson Na'im al-Abboudi as saying.

A few more Shia groups such as Hezbullah Brigades and National Defence Brigades also rejected participation in battles to free Tikrit after the announcing of conducting US-led airstrikes in Tikrit.

Late on Wednesday, Iraqi Prime Minister Haider al-Abadi announced that the Iraqi forces started the final phase to liberate Tikrit and the rest of the northern parts of Salahudin province with the assistance of the international coalition air support.

The battles to free Tikrit from IS militants have been stalled for about two weeks as the militants have planted thousands of bombs and booby-trapped dozens of buildings and cars.

Since March 2, some 30,000 Iraqi troops and thousands of allied Shia and Sunni militias have been involved in Iraq's biggest offensive to recapture the northern part of Salahudin province, including Tikrit and other key towns and villages, from IS militants.

Large parts of the province have been under IS control since June 2014, after bloody clashes broke out between Iraqi security forces and the group.

The IS took control of the country's northern city of Mosul and later seized swathes of territories in Nineveh and other predominantly Sunni provinces.