DERA ISMAIL KHAN, July 25 -- Islamist militants rammed an explosive-laden vehicle into a Pakistani security checkpoint, killing 15 people, including 12 soldiers, in northwest Pakistan, the military said on Friday, adding that 12 militants had been killed in retaliation. The attack took place overnight between Thursday and Friday in Tank district near the Afghan border. Tehreek-e-Taliban Pakistan claimed responsibility for the attack.P11...