Gunmen killed three policemen and a government worker walking to work in Baghdad, officials said Monday, one day after four suicide car bombings killed 22 people. Insurgents in a car opened fire Monday on a police patrol in the eastern New Baghdad neighborhood of the capital, killing two policemen, police 1st Lt. Ali Abaas said. In a separate attack in the same neighborhood, police Col. Alaa Hussein was killed near his home late Sunday, Abbas said. Elsewhere, insurgents Monday gunned downed Maissa Jassim, a worker for the Iraqi Trade Minister, in the southern neighborhood of Dora, The Associated Press quoted Dr. Muhanad Jawad of the Yarmouk hospital as saying.