Four militants were killed in a US drone attack in country's northwest tribal belt on Saturday, security officials said. The missiles targeted a compound used by militants in Kutabkhel village, some three kilometres south of Miranshah, the main town in North Waziristan tribal district, a security official based in Peshawar told a foreign news agency. "A US drone fired four missiles. They targeted a compound and also a car outside the compound," the official said. The drone strike was also confirmed by two intelligence officials in Miranshah.