PESHAWAR - At least 20 people were killed in a US drone attack in North Waziristan Agency (NWA) on Monday night. Sources informed that a suspected militant compound was targeted with three missiles in Dandey Darpa Khel village, some five kilometres away from Miranshah. Official sources confirmed the attack saying that the number of casualties could increase. Reuters adds: Missiles fired from a US pilotless drone aircraft killed 13 militants and 7 civilians on Monday, Pakistani intelligence officials said. They said the missiles were fired at a militant hideout. Most of the militants killed were members of the Afghan Taliban. Four women and three children were among the dead, said the officials. The missiles hit a militant compound and a house adjacent to it. We have confirmed reports of 20 dead, said one of the intelligence officials. Another official said members of the Al-Qaeda-linked Haqqani network one of the most effective militant forces fighting Western troops in Afghanistan had been using the compound. US officials say the drones are a highly effective weapon against militant groups. But civilian casualties in the strikes have angered Pakistanis.