Militants riding on a motorcycle shot and killed two policemen Friday in northwestern Pakistan, a region bordering Afghanistan where violence has spiked in recent months, police said. The Pakistani Taliban promptly claimed responsibility for the attack. In a separate statement, A police statement said a search was underway to find the pair of gunmen who had fled the scene of the attack in Lakki Marwat, a town in Khyber Pakhtunkhwa province. KPK Police Constable Samiullah was martyred last night and Additional SHO Habibullah was injured when terrorists opened fire on their vehicle in Shadikhel,…