Islamabad, Pakistan (CNN) -- Six militants died in a U.S. drone strike in Pakistan's tribal region Friday, intelligence officials said.
The intelligence officials, who asked not to be named because they are not authorized to speak to the media, said a militant hideout was targeted.
The attack occurred in the Miran Shah area of North Waziristan, one of seven districts in Pakistan's volatile tribal region bordering Afghanistan.
Pakistan has been critical of drone strikes, many of which have occurred in North Waziristan, with one Foreign Ministry official saying that such attacks have been counterproductive in the effort to win grass-roots support for the fight against militants.
While suspected militants have been killed, the strikes have also caused civilian casualties, angering citizens.
The United States does not officially comment on suspected drone strikes. But it is the only country operating in the region known to have the ability to launch missiles from drones, which are controlled remotely. September has seen more attacks than any other month since strikes from the unmanned aerial vehicles began.
Journalist Nasir Dawar contributed to this report.