A suicide bomber rammed an explosives-laden vehicle into a security convoy in northwest Pakistan bordering Afghanistan on Saturday, killing two soldiers, including a lieutenant colonel, the Pakistani military said.It said the attack took place in Bannu, a district in Khyber Pakhtunkhwa province where security forces have battled militants for years. For all the latest headlines, follow our Google News channel online or via the app.The military said Pakistan would not “exercise any restraint” and that operations against those responsible for the violence would continue “irrespective of their location,” language that appeared to signal rising tensions between Islamabad and Kabul.No group claimed responsibility, but suspicion is likely to fall on the Pakistani Taliban who have been blamed for previous such attacks. There was no immediate statement from the Afghan government.The latest attack came two days after Pakistan’s Foreign Ministry summoned a senior Afghan diplomat and lodged a