A Los Angeles International Airport security screener was arrested hours after quitting his job for making unspecified threats referencing Wednesday’s Sept. 11 anniversary and calling airport officials and telling them to evacuate terminals, the FBI said.

Parts of the nation’s third-largest airport were cleared and searched late Tuesday. Nothing was found and there were no major disruptions to flights.

The former screener, Nna Alpha Onuoha, 29, was arrested just before midnight for investigation of making threats.