A Delta Airlines flight that landed at a Denver airport was directed to a remote taxiway after an unspecified “potential security threat” onboard and passengers were ushered off the plane, but authorities later saw the threat as unlikely to be credible.

Flight 1500, a Boeing 737 with 151 passengers and six crew, landed roughly on time at Denver International Airport from Detroit Metropolitan Airport at about 4:40 p.m., airline spokesman Russell Cason said.

The passengers were quickly sent off the plane without their luggage and taken by bus to a separate part of the airport, where they were being interviewed by the Federal Bureau of Investigation (FBI) officials. There were no reports of injury.

After screening passengers, crew and the plane, authorities said by 10 p.m. local time all travellers were allowed to collect their bags and go on their way, with no arrests made. “We currently do not believe a creditable threat existed to the flight,” said FBI spokesman Dave Joly.