A Sunni fighter who has joined Shi’ite militia groups known collectively as Hashid Shaabi (Popular Mobilization), allied with Iraqi forces against the Islamic State, looks at an Islamic State flag and ammunition displayed in al-Alam Salahuddin province March 15, 2015.

Iraq’s huge offensive to retake Tikrit from the Islamic State group is being stalled by bombs planted by the jihadists holding out in the city, a militia spokesman said Tuesday.

“The battle to retake Tikrit will be difficult because of the preparations (ISIS) made,” said Jawwad al-Etlebawi, spokesman for the Asaib Ahl al-Haq, a Shiite militia that is playing a major role in the operation alongside the regular army.

“They planted bombs on all the streets, buildings, bridges, everything. For this reason, our forces were stopped by these defensive preparations,” Etlebawi told AFP.

“We need forces trained in urban warfare to break in,” he said, adding that the jihadists are surrounded, “but any besieged person fights fiercely.”

The operation to recapture Tikrit, the capital of Salaheddin province, began on March 2.

While Iraqi forces succeeded in surrounding the city and retaking towns across the Tigris river to the east, gaining ground inside it has proved much more difficult.

Staff Lieutenant General Abdulwahab al-Saadi, the top army commander for Salaheddin, told AFP on Sunday that the forces attacking Tikrit needed air support from the US-led coalition.

Saadi said that he had asked the defense ministry to make the request to the coalition, but that no air support had been forthcoming.

ISIS spearheaded a sweeping offensive that overran large areas north and west of Baghdad last June.

Iraqi forces backed by the U.S.-led coalition and Iran are battling to push the militants back.

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