Travelers at Chicago's O'Hare International Airport got a brief scare Sunday over what turned out to be a wayward set of keys. As CBS News reports, police were called around 9:21am to Terminal 2 after reports of a beeping sound coming from a trash can, prompting restricted access to parts of the area while officers checked it out. The culprit: a discarded key fob, authorities said. The terminal remained open throughout, and Chicago police gave the all-clear a little while later, notes CBS. No injuries or threats were reported.