A suspected US drone fired a missile on Thursday into Pakistani territory on the Afghan border, killing at least one militant, intelligence agency officials said. The missile hit a house in the village of Sam in South Waziristan, in an area known as a stronghold of Baitullah Mehsud, head of Pakistani Taliban militants. "So far, we have confirmation of one militant dead and two wounded have been retrieved from the debris," said an intelligence official who declined to be identified, adding the death toll could rise."Guests were staying there," said another intelligence agency official, using a term commonly used to refer to foreign militants. Pakistani military spokesman were not immediately available for comment. US officials say al Qaeda and Pakistani Taliban militants operate out of safe havens in northwest Pakistan, training for an intensifying insurgency in Afghanistan that has helped make that country deadlier now than Iraq for US troops. US impatience has been growing over what Washington sees as Pakistan's failure to eliminate the militant threat from their sanctuaries in remote ethnic Pashtun regions. The second intelligence official said two missiles were fired on Thursday. A resident of Sam said by telephone two big explosions had shaken the village. The first intelligence official said militants had cordoned off the area and were not letting anyone approach.