The terror group led by Abu Musab al-Zarqawi says it is behind the killing of at least 17 members of the Iraqi security forces in the northern city of Mosul.
Al-Qaida in Iraq made the claim in an Internet posting that could not be independently verified. U.S. forces have found the bodies of more than 50 people in Mosul in recent days. Most of them were Iraqi security personnel and were shot execution-style.
To the south, a car bomb killed five civilians in Samarra, one of the main insurgent centers north of Baghdad.
South of capital, the U.S. military says two Marines were killed as troops pressed on with raids against Sunni insurgents.
Meanwhile, Iran offered to train Iraqi border guards to help strengthen their 1,600-kilometer common border.