(Reuters) - A U.S. drone strike on suspected Islamist militants in northwest Pakistan killed 10 people on Thursday, intelligence officials said, an attack likely to raise tensions in a standoff with Washington over NATO supply routes to Afghanistan.

The pilotless drone aircraft fired two missiles at a compound in a village in North Waziristan, a day after a similar attack killed four suspected militants in the same region.

(Reporting by Haji Mujtaba in Mitanshah and Jibran Ahmad in Peshawar; Writing by Michael Georgy; Editing by Paul Tait)