Gunmen shot dead eight policemen Sunday in a Cairo suburb, the latest in a series of assaults targeting security forces in Egypt, dpa reported. The plainclothes officers were inside a small bus in the southern suburb of Helwan when the gunmen came out of a pickup truck, opened fire and then fled, the Interior Ministry said in a statement. The attack was carried out by four assailants using automatic rifles, the ministry added. There were conflicting claims of responsibility for the ambush.