The U.S. military on Sunday announced the deaths of 12 U.S. soldiers killed Friday and Saturday.

Four of the soldiers, from the 1st Armored Division (search), were killed Friday in two separate attacks in Baghdad, the military said in a statement.

In the region of Tikrit (search) on Friday, three 1st Infantry Division soldiers were killed and two wounded in an ambush in the town of Baiji, 120 miles northwest of the capital. Another soldier, from Task Force Danger, died when an RPG hit his armored vehicle near Buhritz, in the same area.

A Marine was killed Saturday in Anbar (search), a large western province, the statement said, giving no further details.

A 1st Armored Division soldier was killed in an attack on his convoy late Saturday in downtown Baghdad. A soldier wounded by a roadside bomb in Baghdad on Saturday died the next day.

A 1st Infantry Division soldier was killed and another wounded early Saturday when 15 insurgents attacked his patrol near Khalis, 30 miles north of Baghdad.

Including the newly announced deaths, 59 American soldiers have been killed in fighting across the country since April 4, when an uprising by a radical Shiite militia in the south and a Marine offensive on Sunni insurgents in Fallujah began.

At least 661 U.S. soldiers have died in Iraq since the war began in March 2003.