Islamabad, Pakistan (CNN) -- A drone attack targeting a militant compound killed six people in Pakistan's northwest Sunday.
All six were suspected militants, two intelligence officials said. The officials asked not to be identified because they are not authorized to speak to the media.
The suspected U.S. drone fired two missiles at a compound about 22 km (13.6 miles) west of Miranshah, a city in North Waziristan.
North Waziristan is one of seven districts in Pakistan's tribal region along the Afghan border.
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, which have caused tension between Pakistan and the United States in the past.
Separately, two people were killed and 12 injured when a bomb exploded in southern Pakistan on Sunday, authorities said.
The blast took place around 10:30 a.m. at a busy town square in Dadu city just as a police van was passing by, said Inspector Ghulam Muhammad Memon.
Among the 12 injured was a police officer. The blast destroyed several nearby shops, Memon said. Police are investigating to see if the blast was caused by a suicide bomber.
Dadu city is in the district of Dadu in southern Sindh Province. The district is a relatively peaceful region that has been free of militant activity.
Journalist Nasir Habib contributed to this report.