Two gunmen have been arrested in northwestern Pakistan for the murder of a pro-government tribal elder suspected of informing on Al-Qaeda-linked militants, police said. Mehsud tribal elder Rasool Khan was shot Saturday in the Tank district of South Waziristan, a semi-autonomous region bordering Afghanistan Afghanistan where Pakistani forces are hunting militants. The detainees, identified as Ehsan Ullah and Saeed Alam, told investigators they shot Khan because he had been providing information to authorities about Al-Qaeda linked militants, local police official Javed Chughtai said on Sunday. Members of the dominant Mehsud tribe last week agreed to sell their heavy weapons under a government buy-back drive as part of an effort to keep arms out of the hands of militants.