Security screening at terminals 5, 6 and 7 was halted while police went to look for the man. As a result, thousands of people were forced to wait inside and on the sidewalk to go through security.
The passenger apparently didn't understand that his bag needed more screening but it's unclear how he got through security without being stopped.
The man was located on a United plane, returned to the terminal and re-screened. His bag was checked, nothing dangerous was found and the incident ended at 6:48 a.m.
