A powerful roadside bomb blew up a vehicle, killing five people, including a regional government official, in troubled northwestern Pakistan on Saturday, a security official said. Two policemen, a local journalist and the driver also were killed near the village of Salazai, about 15 kilometers (9 miles) north of Khar, the main town in the Bajur tribal region. An area security official, Mamoor Khan, said the car, carrying official Wasal Khan, was going to a village to demolish the house of a militant accused of killing a doctor this year. The journalist, who worked for a local newspaper, was accompanying them.