Two policemen were killed in separate attacks in Iraq on Saturday as four mortar shells landed near Baghdad's heavily- fortified green zone, security sources said, dpa reported.
Sources said that the shells targeted the US and British embassies in the green zone, which is home to government offices, parliament as well as diplomatic missions. There were no casualties.
In the northern city of Mosul, one policeman was killed and another injured in an exchange of fire with gunmen near a checkpoint.
Another policeman was killed when an explosive device planted in his car went off in Kirkuk, security sources said.
Security forces have increasingly been coming under attack from insurgents in recent months, as the US security presence in Iraq declines.
The US military, which led the invasion in 2003, said it still has a force of 52,000 in Iraq, all of whom are due to leave by the end of 2011.