Militants killed at least three Pakistani soldiers in an attack early Saturday on a border post in the restive northwestern tribal belt, officials said. br br Around two dozen militants armed with sophisticated weapons crossed from the Afghan province of Kunar to launch the pre-dawn ambush in Bajaur district, Pakistani officials said. br br "Militants from across the border ambushed a check post. Two security personnel and an officer embraced martyrdom in the attack," a security official in Bajaur told AFP by telephone.