Baghdad, Iraq ? Iraq’s government clamped a state of emergency on Baghdad and ordered everyone off the streets Friday after U.S. and Iraqi forces battled insurgents armed with rocket-propelled grenades, hand grenades and rifles near the heavily fortified Green Zone.

The military also announced the deaths of five more U.S. troops in a particularly violent week for American forces that included the discovery of the brutalized bodies of two soldiers. Twelve U.S. servicemembers have died or been found dead this week.

The fierce fighting in the heart of Baghdad came despite a crackdown launched 10 days ago that put tens of thousands of U.S.-backed Iraqi troops on the streets as the new prime minister sought to restore a modicum of safety for the capital’s 6 million people.

Iraqi and U.S. military forces clashed with heavily armed attackers throughout the morning Friday in the alleys and doorways along Haifa Street and within earshot of the Green Zone, which houses the U.S. and British embassies and Iraqi government headquarters.

Iraqi civilians rush home as plumes of black smoke rise in Baghdad. The Iraqi government declared a state of emergency Friday in Baghdad, following clashes that broke out on Haifa Street, a dangerous thoroughfare.

Four Iraqi soldiers and three policemen were wounded before the area was sealed and searched house-to-house for insurgent attackers, police Lt. Maitham Abdul Razzaq said. U.S. and Iraqi forces also engaged in firefights with insurgents in the dangerous Dora neighborhood in south Baghdad.

Deadly clashes are not new to Haifa Street, a thoroughfare so dangerous that a sign at one Green Zone exit checkpoint warns drivers against using the street. But Friday’s fighting was unusual in its scope and intensity, prompting Prime Minister Nouri al-Maliki to order everyone off all streets in the capital with just two hours’ notice and while Friday prayers were still in progress.

Haifa Street was the scene of some of the heaviest resistance when U.S. forces swept into Baghdad in March 2003, and it has remained difficult to control because many residents have natural links to the Sunni-led insurgency. It is lined with tall and relatively new buildings put up by former leader Saddam Hussein to house Syrian refugees loyal to him and members of his security forces.

The state of emergency, which was to continue for an indefinite period, included a renewed prohibition on carrying weapons and gave Iraqi security forces broader arrest powers.