Two soldiers and one marine were killed in Anbar on Sunday "while conducting combat operations," a statement said.

Another soldier was killed while on patrol on Sunday with Iraqi national police in western Baghdad, when insurgents detonated a roadside bomb and then opened fire on them. Two Iraqi policemen were also wounded in the attack.

Insurgents ambushed another US military patrol in southern Baghdad, killing one soldier.

The latest fatalities took the military's losses in Iraq since the March 2003 invasion to 3,575, according to an AFP count based on Pentagon figures.

Meanwhile, Iraq's highest criminal court has sentenced four alleged terrorists to death, including two foreign fighters from Yemen and Saudi Arabia, the US military said on Monday.

"The Central Criminal Court of Iraq convicted 46 individuals from June 10 to June 21 for violations of the Iraqi Terrorist Law," it said in a statement. Four were condemned to death and three sentenced to life in prison.

Nabil Ahmed Awudah, 28, a Yemeni, and Faysal Abdallah Al-Faraj, 22, a Saudi, were both sentenced to death for planning and participating in "terrorist operations" in Iraq, the statement said.

US forces arrested Faraj near Baghdad last September. He "confessed he was recruited by Al-Qaeda to attack multinational forces in Iraq and that he had participated in an attack on a convoy September 5," the statement said.

Ziyad Khalaf Husayn, 26, and Jassim Mohammed Madloom, 28, both Iraqis, were also sentenced to death for violating Iraq's terrorist laws.

Madloom "was convicted and sentenced to death June 21 for participating in multiple terrorist attacks, belonging to the Jaish Al-Mujahedeen terrorist organisation, and kidnapping and killing Iraqi policemen," the statement said.

He "confessed that his organisation targeted Iraqi police, Iraqi army, multinational forces and an Iraqi elementary school... after he returned from al-Qaeda terrorist training in Syria."

Sayf Al Din Hamzah Jasim, 22, Hamzah Ahmad Ibrahim, 44, and Khalil Thabit Fahad Ali, 36, all Iraqis, were convicted on terrorism charges and sentenced to life imprisonment.

Another 39 Iraqis were sentenced to jail terms ranging from one to 30 years, all on terrorism-related charges.

Since the court was established by the US-led Coalition Provisional Authority in April 2004 it has held 2,255 trials and convicted 2,003 individuals.