PESHAWAR - At least six militants were killed and several others injured when three missiles, fired by suspected US drones, hit houses in Ladha area of South Waziristan, the base camp of Tehreek-e-Taliban's head Baitullah Mehsud but officials were unable to confirm he was the target of the attack.   Three missiles hit the houses of Ghazi Marjan Mehsud, his cousin Dr Badshah and a vehicle in village Saam of Laddha sub-division. Soon after the missile attacks, a large number of militants cordoned off the area and didn't allow anyone to take part in the rescue activities. The local tribesmen informed that around six people were killed and five others injured in the attacks. However, Taliban militants claimed that only one person was killed and two others were injured in the incident. But some tribesmen believe that number of killed persons might be more, as the place was a militants' stronghold. Agencies add: Two US drones fired the missiles at the house of Ghazi Mehmood in Saam, an area of Ladha.  "The missiles completely destroyed the house," a security official said on condition of anonymity. There was no immediate confirmation of the strike from the Pakistani military or from the US-led coalition in neighbouring Afghanistan. Local tribesmen said the drones fired three missiles, which affected the houses of Mubashar Khan and Saray Khan while one vehicle was also targeted. Most of the victims were locals, tribesmen said. Ladha is considered a strong base camp of Tehreek-e-Taliban's head Baitullah Mehsud but officials were unable to confirm he was the target of the attack. It is worth mentioning that US has targeted this area for the first time. Mehsud was accused by Islamabad and the United States of masterminding the killing of former premier Benazir Bhutto in December 2007.