Threats made against Melbourne airports

File photo / Thinkstock

Police are on the scene at two Melbourne airports after receiving an anonymous threat today.

Police say the threat was made shortly after 10.30am (AEST).

"We are currently responding to an anonymous threat made against the two airports," a police spokeswoman said.

"Police are assessing the threat and working closely with the AFP (Australian Federal Police) and airport security."

The airports involved are Melbourne and Avalon, which is located west of the city.

Avalon Airport chief executive Justin Giddings said a "non-specific" threat had been made against the airports earlier today.

He said the scare was not a bomb threat and no flights had been cancelled or delayed.

"We've consequently increased security and we're continuing to liaise with both state and federal authorities," Mr Giddings said.

"The only difference passengers coming out to Avalon will notice is a lot more security guards."

He said he expected the heightened security to continue at the airport for at least a week.

For many years Avalon was only known as the privately owned training ground of Qantas pilots and host to the annual Australian International Air show.

It's now widely accepted as the second entrance port to Melbourne.

- AAP