BAGHDAD (AFP) - At least eight people were killed and 22 wounded in separate attacks on police and a pro-US militia leader in Iraq on Wednesday, police said. Local Sahwa militia leader Dhiab al-Ali, his wife, son, and grandson were killed when a roadside bomb hit their car near Balad, 75km north of Baghdad, said the police. In central Baghdad, a suicide bomber killed two policemen and wounded 12 more people, defence and interior ministry officials said. In Mosul, a suicide car bomb targeted a police roadblock, killing two police officials and wounding 10, including eight policemen, a security officer said. An American soldier died of wounds he received when hit by rocket or mortar fire in the northern city of Mosul, the US military said. "A Multi-National Division-North Soldier died from injuries sustained during an indirect fire attack in Mosul, Iraq," a statement said. His name was being withheld pending notification of his next of kin and release by the US Department of Defence. The US army says that Mosul is the last bastion of Al-Qaeda in Iraq. At least 4,255 US military personnel have died in Iraq since the March 2003 US-led invasion, according to an AFP tally based on the independent website www.icasualties.org.