Iraqi Police on Friday detained a fellow officer accused of helping insurgents kill the mayor of Iskandariyah, south of Baghdad, the day before.

Officers had written sworn statements describing how the policeman was on duty and acted as a spotter when a bomb went off, killing Mayor Abbas Hassan Hanza, according to a press release issued late Saturday by the Multi–National Corps – Iraq.

Hanza, a political moderate, was killed when the explosively formed penetrator struck his convoy while he was going to work, The Associated Press quoted a police officer as saying.

Four of his bodyguards also were killed.

Hamza defected two years ago to Prime Minister Nouri al-Maliki’s Dawa Party from the largest Shiite party, now known as the Supreme Islamic Iraqi Council, according to AP.

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