A roadside blast hit a police patrol in eastern Afghanistan Thursday, killing five officers and wounding another, an official said. The attack happened in Yaqoubi district, in Khost province, said Wazir Pacha, a spokesman for the provincial police chief. The victims were part of a joint US-Afghan patrol, Pacha said. No US-led coalition troops were injured in the morning blast. Police sent additional troops to the area to conduct a search operation, he said.