Two assaults in the northwest region have killed more than 20 people in recent days, threatening Islamabad’s shaky truce with the Taliban. An attack on a security compound in northwest Pakistan has killed several paramilitary officers, with the Afghan-based Pakistan Taliban ( TTP ) claiming responsibility. An armed group rammed a vehicle filled with explosives into the Bajaur district camp’s gate on Thursday and then launched a gun battle, security sources said. It was the latest in a string of deadly incidents in the border region that threaten the fragile ceasefire between Islamabad and Kabul.…