(Adds details, quote) By Haji Mujtaba MIRANSHAH, Pakistan, May 24 (Reuters) - A U.S. drone strike on suspected Islamist militants in northwest Pakistan killed 10 people on Thursday, Pakistani intelligence officials said, an attack likely to raise tensions in a standoff with Washington over NATO supply routes to Afghanistan. The pilotless drone aircraft attacked a compound in a village in North Waziristan, a day after a similar attack killed four suspected militants in the same region.