Both levels of Terminal 5 at LAX were evacuated Friday morning following a large police presence at the airport.
Airport officials said a "suspicious vehicle" prompted a security concern at Terminal 5 at about 5:20 a.m.
"As per operational protocols, an explosive detection K9 was requested to clear the vehicle," said airport police in a statement. "While sweeping the vehicle the K9 alerted to an unknown scent causing the incident to be upgraded to suspicious. As a matter of public safety, traffic was diverted and passengers were restricted from the immediate area as well as the adjacent areas within the terminal."
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LAPD's Bomb Squad was called to the scene and shortly before 7 a.m., the "all clear" was given and the airport began returning to normal operations.
LAX spokesman Charles Pannunzio said no flights were delayed as a result of the incident, but encourages passengers to check with their airlines to make sure departures are on time.
Terminal 5 houses American Airlines, Spirit, JetBlue, Hawaiian Air, and Air Canada.
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No further details were immediately known.