PESHAWAR At least 13 militants were killed and seven others were injured when a suspected US unmanned aircraft fired missiles in North Waziristan Agency on Saturday. The US drones reportedly fired two missiles at a suspected militant compound at Inzar Kalli, 30-km from Miran Shah, headquarters of North Waziristan Agency. Two missiles struck the house in Haider Khel village and killed at least 13 militants and injured seven others reportedly. The sources also confirmed death of at least 13 militants and seven others falling injured in the US drone attack. After the attack, the drones continued hovering over the area for a while which created fear among the residents of the area. According to sources, it was believed that all those who were inside the house had been killed. The sources said that more than 900 people had been killed in over 100 drone strikes in Pakistan since August 2008, adding more than 200 people had been killed in similar attacks in North and South Waziristan since the start of 2010. Pakistan has time and again publicly criticised drone attacks, saying they fuel support for militants. Reuters adds - The missile attack took place hours after the US special envoy for Afghanistan and Pakistan, Richard Holbrooke, landed in Islamabad for talks as part of the Pakistan-US strategic dialogue initiated in March. The drone targeted a suspected militant compound in Sokhel village, about 25 km (16 miles) east of Miranshah, the main town of the region and known as a hotbed of Taliban and al Qaeda militants, the intelligence officials said. A resident, Mohammad Rafiq, told Reuters he had seen 11 bodies. The nationalities of the dead were not immediately available. The United States has stepped up missile strikes in Pakistans northwestern region since a Jordanian suicide bomber killed seven CIA employees at a US base across the border in Afghanistans eastern Khost province in December. Most of this years attacks have been in North Waziristan. Al Qaedas number three, Sheikh Saad al-Masri, also known as Mustafa Abul al-Yazid, was believed to have been killed in a similar strike in North Waziristan last month.