Violence across Iraq claimed three lives and wounded 10 others on Friday, local police sources said, Xinhua reported.
In the northern city of Mosul, a roadside bomb detonated while some policemen were defusing it, leaving two policemen dead and eight others injured, local police source told Xinhua on condition of anonymity.
Mosul, some 400 km north of Baghdad, is among the most dangerous places in the country and has been the hotbed of insurgency and sectarian violence since the U.S.-led invasion in 2003.
Later in the day, a police colonel was killed by unidentified gunmen who used weapons with silencers in the Bayaa area southwest of the capital.
Two intelligent agents were also attacked by gunmen using silenced weapons in Harithaya area west of Baghdad, a police source said. Both of them survived the attack but were left wounded.
Assassinations and shootings targeting Iraqi security forces and governmental officials are on the rise in recent months.