THE BURNED OVER DISTRICT

Before the struggle for power amongst the groups in Iraq devolved into actual shooting. And it looks like that time is now.

In what appeared to be a new phase in an intensifying conflict that has raised fears of greater bloodshed and a wider sectarian war, Iraqi soldiers opened fire from helicopters on Sunni gunmen hiding in a northern village on Wednesday, officials said.

The air attacks were among clashes throughout the country between forces of the Shiite-dominated Iraqi government and Sunni gunmen that left at least 27 people dead and dozens wounded. The Sunni tribesmen were continuing a fight that began on Tuesday after the Iraqi Army stormed a Sunni protest encampment in the village of Hawija, leaving dozens dead and injured.

Several others were killed on Wednesday in explosions, including the detonation of a car bomb at a public market in the evening in a Shiite neighborhood north of Baghdad, and a roadside bomb attack on an army patrol in Tikrit, also in the north.

The deadliest battles occurred near Hawija and Sulaiman Pek, northern towns near Kirkuk, and battles were still raging in the early evening. In Hawija, the army shut off electricity, and troops shouted through loudspeakers, urging civilians to evacuate, witnesses said. Government helicopters also fired at Sunni gunmen on the ground in Sulaiman Pek.

The Sunni uprising, having now turned violent, represents a significant challenge to the rule of Prime Minister Nuri Kamal al-Maliki, whose consolidation of power over the security forces and the judiciary, and his targeting of high-level Sunni leaders for arrest, has raised alarms among world powers. Mr. Maliki has presided over an unwieldy power-sharing government, which nominally gives prominent roles to Sunnis but in reality has resulted in political stasis, and he has signaled in recent months that he would prefer to move to a majority government, dominated almost solely by Shiites. On Tuesday, two Sunni ministers quit to protest the raid in Hawija, and the largest bloc of Sunni lawmakers suspended participation in Parliament.

Maliki said he would look into it, but the man like new suits and polished shoes too much to find anything damaging to his side.