Gunmen shot and killed a Shiite Muslim tribal elder in volatile northwestern Pakistan on Saturday, police said. Syed Maqbool Shah, 45, was standing on a street in the town of Tank - about 335 kilometers (210 miles) southwest of Islamabad - when unidentified assailants opened fire, killing him on the scene before fleeing, said Amir Abdullah, an area police official. No one immediately claimed responsibility for the attack. Abdullah said police were investigating.