BAGHDAD, Iraq — Fighting between suspected insurgents and Iraqi police killed at least six civilians in Baghdad today, and roadside bombs killed three U.S. soldiers, officials said.

Another bomb destroyed a liquor store in Baghdad in what appeared to be the third attack on the shop by militants determined to impose Islamic customs by closing down such establishments. The blast, one of three heard just past dawn, shook much of central Baghdad.

The gunbattle in Baghdad broke out about 10:30 a.m. between suspected insurgents riding in three cars and Iraqi police in Dora, one of Baghdad's most violent neighborhoods.

At least six civilians were killed and four wounded in the crossfire, said police 1st Lt. Maithem Abdel-Razaq.

The U.S. Army soldier died when a roadside bomb exploded near Rasheed airfield, a former Iraqi air force installation in southern Baghdad, damaging a Humvee and also wounding an Iraqi civilian, said police Lt. Mohammed Hanoun.

The soldier was on a foot patrol near the convoy at the time, the U.S. command said.

Two other soldiers from 3rd Heavy Brigade Combat Team, 4th Infantry Division, were killed Monday when their vehicle struck a roadside bomb near Ballad, 50 miles north of Baghdad.

Iraq's interior ministry also announced today that it had arrested two al-Qaida in Iraq members the day before: Salah Hussein Abdul-Razzaq in Ramadi and Omar Ahmed Salah in Baghdad.

In other violence, according to police:

—n Suspected insurgents attacked a police patrol at 7:30 a.m. today in Kirkuk, 180 miles north of Baghdad, killing two policeman.

—n A drive-by shooting killed an Iraqi man in Kut city, 100 miles southeast of Baghdad, who had served as a secret agent in Saddam Hussein's government.

——n Gunmen in eastern Baghdad killed police 1st Sgt. Latif Abdullah, who worked in Interior Ministry intelligence.