A suicide car bomb went off at the entrance of a police commando headquarter near the heavily fortified Green Zone in central Baghdad on Thursday, wounding two policemen, a police source told Xinhua.

"A suicide bomber blew his explosive-laden vehicle up at the entrance of the police commando headquarters at the Nusour Square near the Green Zone which houses the Iraqi government offices and the US embassy," the source said on condition of anonymity.

The blast, which took place at about 9:40 AM (06:40 GMT), was powerful but the cement barriers protected the guards, minimizing the casualties to two wounded along with killing of the suicide bomber, he said.

Earlier, a roadside bomb killed a civilian and wounded two others when it missed a police patrol in central Baghdad, according to the police.

(Xinhua News Agency March 31, 2006)