Officials at San Francisco International Airport evacuated passengers from a United Airlines flight "out of an abundance of caution" and forced them to go through security screening a second time after a teenager sent a photo of an airsoft gun to other passengers on the plane via Airdrop, an airport spokesman, Doug Yakel, told KNTV.
The plane was then inspected, but nothing suspicious was found on board.
The airport officials determined that the photo of the gun was taken at an earlier date and at a different location. Although the teen did not have the gun on him, he was not allowed to get back on the flight.