It was not clear whether the airstrikes were being carried out by Iraq’s air force or the US.
Sunni militants successfully stormed the Mosul Dam and forced Kurdish forces to withdraw from the area.
Militiamen brought four bodies back and paraded through town in their cars, dragging the corpses behind them,” said the police.
In June, the Islamic State launched a massive blitz offencive that brought large swaths of northern and western Iraq under their control.
Ministry is making efforts to secure the release of 39 Indians who are in captivity of Sunni militants.
“Every possible effort well beyond diplomatic possibilities are being explored.”
The militants have captured several areas west of the city since the fighting broke out Thursday afternoon.
Kurdish independence is opposed by the U.S., as well as by Iraq’s regional neighbors, Turkey and Iran.
The army sent in tanks and helicopters to battle ISIL militants near the University of Tikrit in the city’s north on Sunday, security sources said.
There were conflicting reports as to how far the military advanced in its initial thrust toward the northern city.
Witnesses said loyalists were moving toward Tikrit from the west and engaged in heavy clashes.
The Pentagon confirmed that among the manned and unmanned US aircraft flying over Iraq to carry out surveillance, some were carrying bombs and missiles.
Many villagers have been granted access by daybreak, hundreds of Shiite refugees were still facing the delays.
Bombs have damaged the structures, however, no casualties have been reported so far.
The refinery is located in the heart of the Sunni- dominated areas in northern Iraq.