ISLAMABAD -?At least four people were killed in a US drone strike launched in Pakistan's northwest tribal area of North Waziristan on Sunday morning, reported local media.

Local Urdu TV channel Geo said that the strike came at about 10: 50 am local time when US unmanned aircraft fired two missiles at a house suspected of being a militant hideout in the Dargah Mandi area of Miranshah in North Waziristan.

Identities of the killed are not immediately known.

Sunday's US drone strike in North Waziristan is the 21st of its kind in Pakistan in 2013. According to Xinhua's tally, at least 117 people have reportedly been killed in such strikes since the start of the year.