Pakistani troops backed by helicopter gunships attacked Islamist militants close to the Afghan border, killing 15 of them, a government official said Monday. The violence Sunday took place in Mohmand tribal region hours after suspected Taliban fighters killed 13 paramilitary police officers. In late February, the military took journalists to Mohmand and neighboring Bajur and claimed major security gains in both regions. Meraj Khan, a government representative in Mohmand, said the attack on the militants took place late Sunday in the Salam Koroona area. He had no more details, and the Taliban were not immediately available for comment.