A U.S. drone may have crashed on Saturday in North Waziristan, not far from the Afghan border, Pakistan intelligence officials said.

A drone aircraft was seen going down in Machikhel and flames were seen, a Pakistani intelligence official said.

We don't know what caused it to go down. We are investigating.

(Reporting by Haji Mujtaba and Saud Mehsud; Writing by Chris Allbritton; Editing by Sophie Hares)