No explosives found on Denver flight - 'CNN'
Earlier reports indicated that US air marshals subdued a Qatari diplomat who authorities said tried to "light his shoes on fire".
Authorities found no explosives in the shoes of a Qatari man arrested after a United Airlines flight landed safely in Denver following a reported disturbance, CNN reported, quoting sources.
The Transportation Security Administration said in a statement it was "monitoring an incident on board United Airlines flight 663 ... DEN after receiving initial reports that a Federal Air Marshal responded to a passenger possibly causing a disturbance on board this aircraft."
ABC News, citing federal law enforcement officials, reported earlier that US air marshals subdued a Qatari diplomat who authorities say tried to "light his shoes on fire" on the flight from Washington Reagan National Airport.