Two civilians were killed and nine wounded Wednesday in a double roadside bombing in Iraq's northern city of Mosul where US and Iraqi forces have been struggling to root out insurgents, police said. The first attack took place mid-morning as an Iraqi police patrol cruised past, injuring several people, local policeman Ahmed Abdul Karim told a foreign news agency. As people rushed to help the wounded a second bomb detonated, killing two people, he added. No police were injured in the attacks. The US military considers the city, Iraq's second largest, to be the last urban stronghold of Al-Qaeda in Iraq, which is believed to be behind scores of devastating bombings since the 2003 US-led invasion to topple Saddam Hussein.