Troops shot dead a militant who threw a grenade wounding at least two soldiers near Miranshah, the main town in a Pakistani tribal region close to the Afghan border, security officials said yesterday. The grenade attack took place as a military convoy approached the outskirts of Miranshah. Residents said they believed the explosion was caused by something more powerful than a grenade. “There was a huge explosion and then firing broke out. The market is being closed,” a witness said, adding that it was unclear what had caused the blast.Miranshah, in North Waziristan, has been the scene of fierce clashes between Pakistani forces and Al Qaeda-linked militants and local allies among the tribesmen in recent weeks.