MIRANSHAH (Agencies) At least 15 people were killed and several more injured in two suspected attacks by US drones in Pakistans North Waziristan tribal district on Wednesday, a security official said. A US pilotless aircraft fired two missiles at a mud compound in the Dattakhel area near Afghan border, said a local intelligence official who spoke on condition of anonymity. According to the reports we have received, at least eight people were killed in the first attack, added the official. Around an hour later, a second drone missile struck when the locals were retrieving bodies from the rubble of the first attack, killing seven people. The official said the identity of those killed was not immediately known. The area is a stronghold of Hafiz Gul Bahadur, who fought with the Taliban when US-led troops invaded Afghanistan and is reputed to control up to 2,000 fighters whom he sends across the border but who do not attack in Pakistan. It was a huge, fort-like mud-house. They were using it as a training centre and the training centre belonged to Hafiz Gul Bahadur, a Pakistani intelligence official told AFP, on condition of anonymity. At least 74 US drone missile strikes have killed more than 680 people in Pakistan since August 2008. North Waziristan, one of seven districts in Pakistans tribal region, is believed to be a sanctuary for Taliban and Al-Qaeda operatives launching attacks on Western troops in Afghanistan. The US has intensified its drone strikes in the mountainous territory in recent months, apparently as part of its new strategy to tackle the Afghan insurgency. Pakistan publicly opposes such raids, saying they violate its sovereignty and fuel anti-American sentiment. But analysts believe that Pakistani agencies covertly help the US forces in locating and confirming the targets. Dozens of Al-Qaeda members have been eliminated by the drone strikes over the past year. A missile fired by a US unmanned aircraft early August killed former Taliban commander Baitullah Mehsud in South Waziristan, paving the way for a Pakistani army offensive in the rugged district.