Militants struck in at least four areas of the capital, highlighting ongoing security risks as US troops prepare to leave Iraq by a year-end deadline, more than eight years after the US-led invasion that ousted Saddam Hussein. Insurgent attacks on the usually unarmed traffic police have been rare since the reconstruction of the security forces following the 2003 invasion. But Iraq started to arm some traffic police after a series of attacks last year that killed dozens. In Monday’s attacks, a suicide bomber killed one civilian and wounded seven others, including two traffic policemen, when he blew himself up in Baghdad’s west-central Mansour district, an Interior Ministry source said. Near the Sarafiya bridge in northern Baghdad, gunmen in a car opened fire at a group of traffic police, killing four people, including two police, and wounding seven, including three police, security sources said.