Perth airport evacuated for the third time in three months due to false alarm

Hundreds of people have been evacuated from Perth's domestic airport for the third time in three months because of a false alarm.

Terminals three and four were temporarily evacuated shortly after noon today.

Perth Airport later tweeted there had been a false fire alarm, which also forced the evacuation of both terminals on June 8 and August 12.

"Terminals 3 and 4 were temporarily evacuated, following a false fire alarm. Both terminals are now being reoccupied," the tweet read.

In both instances, the alarms went off just after noon.

Passengers travelling in or out of Perth Airport are advised to check with their airline for any possible flight delays.