A bomb explosion ripped through a video shop in a business center of northwest Pakistan on Wednesday, killing three people and wounding three, police said. The blast came as investigators probed who was behind a car bomb that exploded just outside the Danish embassy earlier this week. It could add to concern that Pakistan's efforts to strike peace deals with militants are failing to end violence. Local police chief Abdul Rauf said the latest attack happened in the town of Kohat, about 75 kilometers south of Peshawar, the capital of North West Frontier Province bordering Afghanistan. He said the dead and injured were taken to a hospital. The blast also damaged other video and CD stores nearby. There was no immediate claim of responsibility, but previous bombings in this volatile region have been blamed on pro-Taliban militants who consider music and movies un-Islamic. Just weeks ago, suspected militants sent letters to shop owners in Kohat and elsewhere in the region, warning them to close their businesses.