One US soldier has been killed and 14 injured in a suicide attack on a US base in the Iraqi town of Ramadi.
A pro-American Iraqi leader was targeted in the same town
Three Iraqi attackers also died in the incident, which took place at the 82 Airborne's Champion Base at 1330 local time (1030GMT), military sources say.
The bombers were reportedly disguised as deliverymen taking furniture to the base, the Associated Press reports.
The incident took place in an area that has been the scene of frequent attacks on US troops in the past few months.
The area, known as the Sunni Triangle, was the heart of ousted leader Saddam Hussein's power base.
US soldiers have come under attack there nearly every day, the BBC's Tristana Moore in Iraq says.
Ramadi is about 100km (60miles) west of Baghdad.
Three of the soldiers injured in the attack were taken to hospital, while the other 11 returned to duty, reports say.
A US military statement was quoted as saying that improvements in barriers and other
security measures at the base had minimised injuries.
A pro-American Iraqi leader was the target of a bombing in Ramadi last month.
Sheikh Amer Ali Suleiman - a leader of the Duleim tribe, one of the main Sunni tribes in Iraq - survived the attack, but at least one child was killed in the car bombing.
Thursday's attack on the base at Ramadi comes only days after a suicide bomber drove up to the gates of a base near the northern town of Mosul and detonated his explosives.
That attack wounded about 60 US soldiers.
That attack, in conjunction with Thursday's incident, could represent a change in tactics by the Iraqi insurgents, who have previously relied on road-side bombs and drive-by shootings, our correspondent says.