Melbourne Airport officials say passengers have been evacuated after a threat was made against a TigerAir flight with impacts across the Asian regional carrier's flights.

The incident happened at around 9.00pm and saw people evacuated from the TigerAir terminal and several planes grounded.

No other terminals were affected.

While officials would not confirm the nature of the incident passengers tweeted from the Tullamarine tarmac saying they had been warned about a possible bomb threat.

Passenger Scott Marquardt tweeted he was on "TigerAir flight 539".

"Announcement of POSSIBLE bomb threat at Melbourne airport made by flight crew," he wrote. "So my plane is sitting on the Tarmac."

Passenger Corey Ginnivan tweeted he was also stuck on the runway due to a federal police action but was waiting to be evacuated on bus.

"Currently stuck in the plane on the Tarmac because there's been an "incident" and federal police are involved...," he wrote. "Just found out that Melbourne airport has been evacuated =\ and here we are just chilling on the tarmac."

"Now pulled up at a different terminal waiting for buses to come grab us."