New violence has killed at least 11 people in Iraq, casting a shadow over celebrations to mark the end of the Muslim holy month of Ramadan.

North of Baghdad, near Baquba, gunmen attacked a police checkpoint in the town of Buhriz, killing six officers and wounding at least 10 others.

In the town of Taza, near Kirkuk, a roadside bomb exploded, hitting a convoy of Iraqi soldiers. Five were killed and four were wounded.

And the U.S. military said a roadside bomb blast in east Baghdad killed an American soldier.

Meanwhile, a senior British general, Major General James Dutton, told reporters that sophisticated technology and explosives for making bombs are entering Iraq from neighboring Iran. The general said it is still not clear whether Iran's government, its intelligence service, or other unspecified groups are involved.

Some information for this report provided by Reuters, AP and AFP.