Security forces killed 26 militants on Saturday during an operation in a restive tribal region bordering Afghanistan, a paramilitary unit said. Security officials said helicopter gunships went into action in Mohmand, one of seven lawless tribal districts in northwest Pakistan where Taliban militants are active and paramilitary troops have been operating for months. "Twenty-six militants were killed during a successful action by security forces in Sapri area of Mohmand," the Frontier Corps said. "Frontier Corps troops have also secured the area around Sapri," it added in a statement, giving no further details. Sapri surrounds Yaka Ghund, the main town of Mohmand. The militant death toll could not be confirmed independently as the area is sealed off under military operations. The operation came one day after US President Barack Obama put Pakistan at the centre of the fight against Al-Qaeda as part of a major new strategy in the war in Afghanistan.