Iraqi police say at least seven people were killed in a suicide truck bombing in Fallujah, a former insurgent stronghold west of Baghdad.
Police say the truck was detonated near a line of vehicles waiting at a checkpoint Friday.
Meanwhile, President Jalal Talabani has issued a decree that orders Iraq's new parliament to hold its first session on March 19.
In other developments, at least one policeman was killed and two others wounded in a roadside bomb blast in the northern city of Tikrit.
In Baghdad, a roadside bomb explosion engulfed an American tank. The U.S. military says the crew was not injured.
Thursday, Iraqi authorities hanged 13 insurgents in the first government executions since the ouster of Saddam Hussein in 2003.
Also on Thursday in Washington, U.S. Defense Secretary Donald Rumsfeld urged Iraqis to form a national unity government to lessen the threat of civil war.
The general who commands U.S. military activities in the Middle East, John Abizaid, said Thursday that sectarian tensions in Iraq are at their highest level so far, but the situation is controllable by Iraqi and coalition forces.
Some information for this report was provided by AFP, AP and Reuters.