MIRANSHAH (AFP) Missiles fired from a US drone aircraft slammed into a militant compound near Mirans-hah on Thursday, killing at least four insurgents, officials said. The attack was the fourth US bombing raid since Sunday in North Waziristan. The US drone fired two missiles; one hit a compound and another a vehicle. Four militants were killed in these attacks, a senior security official told AFP from Peshawar. An intelligence official in Miranshah, the main town in North Waziristan, confirmed that four militants were killed, adding: Three of the militants were Afghan militants attached with the Haqqani network. The strike hit the Dandey Darpa Khel area about five kilometres from Miranshah, which is close to the border with Afghanistan. Monitoring Desk adds: Two sons of Jalaluddin Haqqani, leader of the militant network Tehrik-i-Taliban Pakistan (TTP) in the North Waziristan, may have been killed in the US missile attack Thursday, a regional source told CBS News. Haqqani was the intended target, a local government officer said. Instead, the source says, his two sons, one of whom, Seraj, is widely believed to be Haqqanis successor, were hit and killed. A commander in Haqqanis network told CBS News Sami Yousafzai that if Seraj was killed, many replacements remain. There are 'many falcons in the Haqqani family, the commander said in a worried tone.