A US soldier has been killed in a drive-by shooting in the northern Iraqi city of Mosul, the US military says.
US forces have started using more firepower against insurgents
The soldier was on duty at a petrol station when gunmen opened fire from a passing vehicle, US military spokesman Brigadier General Mark Kimmitt said.
The spokesman said he believed "four Iraqis" were involved in the incident.
The shooting brings the number of US soldiers killed in Iraq to 193 since major combat operations were declared over on 1 May.
The latest attack came a day after another soldier from the same US Army 101st Airborne Division was killed by a roadside bomb in Mosul, about 400 kilometres (250 miles) north of the capital Baghdad.
The US troops in Iraq have been facing almost daily attacks by insurgents since Saddam Hussein's forces were defeated on the battlefield.
On Sunday, US General Ricardo Sanchez said he expected more attacks as Washington prepares to hand over power to Iraqis at the end of June.
"We has a soldier today (Monday) at approximately midday (0900 GMT) who was involved in an operation in the vicinity of a petrol station," General Kimmit said.
"There was a drive-by shooting by four, we believe, Iraqis who shot and killed him," he added.
Witnesses said another US soldier was wounded by a gunman who opened fire from the sunroof of a passing black BMW, according to the AFP news agency.
"We heard gunshots, we went outside and we saw two Americans lying on the ground bleeding," said petrol station owner Akwan Abdulkarim Mohammad, quoted by AFP.
The witnesses said other US soldiers rushed to the scene of the shooting to form a cordon around the victims.