ISLAMABAD, Pakistan (AP) — A suicide car bomber attacked a police station on Saturday in northwestern Pakistan, killing four people and wounding about two dozen, underscoring the continuing security threat to the country despite army operations against militants. Also, a paramilitary commander said his forces had killed 25 militants in another area of the volatile frontier region. The blast at the police station in Karak in North-West Frontier Province also toppled a mosque next door, said Ajmal Khan, a government official. Two police officers and two civilians were killed; police officers and civilians were among the wounded. The wounded were taken to a nearby hospital, where some...