A Pakistani militant leader was reportedly killed in a US drone strike in Afghanistan, officials said on Sunday.Mangal Bagh, who heads "Lashkar-e-Islam" group in Pakistan's Khyber region, was wanted for his involvement in attacks on security forces and tribal elders, Xinhua news agency reported.The government had also announced a bounty amounting to Pakistani Rupees 20 million ($190,800) for him.Bagh had fled to neighbouring Afghanistan and had been operating from there, according to security officials.