Islamabad, Pakistan (CNN) -- Suspected U.S. drone strikes left 13 people dead in Pakistan's tribal region, intelligence officials said Saturday.
Unmanned aircraft targeted two hideouts for suspected militants in the Mir Ali area of North Waziristan, the two Pakistani intelligence officials said.
North Waziristan is one of seven districts bordering Afghanistan.
In the first strike, two missiles were fired, killing six suspected militants. In the second strike, one missile killed three suspected militants. Both strikes occurred Friday night.
Earlier in the day, a drone strike killed four suspected militants in North Waziristan's Machi Khel area. Officials said two missiles hit an alleged militant vehicle.
The intelligence officials asked not to be named because they are not authorized to speak to the media.
While the United States is the only country in the region known to have the ability to launch missiles from drones -- which are controlled remotely -- U.S. officials normally do not comment on suspected drone strikes.
Journalist Nasir Habib contributed to this report.