Four Dead After Two Planes Crash In Mid-Air

Four people have died after two planes collided in mid-air north of Melbourne.

Emergency services were called to two separate crash scenes near Mangalore airfield about 11.25am on Wednesday.

Victoria Police confirmed the two occupants in each plane died.

The Civil Aviation Safety Authority and the Australian Transport Safety Bureau have been notified.

Inspector Peter Koger, Mitchell Local Area Command, said both planes were twin-engine training aircraft.

Koger said one plane crashed immediately while the other continued to fly about two kilometres from the airport before crashing.

"Both planes were flying in a similar area, one plane had just left from the Mangalore Airport, the other plane had come from another airport but we are still trying to establish where that is," he told reporters.

"At this point, we are not sure why both aircraft were exactly on the same trajectory or why they were in that area."

The two planes (not pictured) crashed mid-air near Mangalore Airport. Image: Mangalore Airport

Koger said there were witnesses to the planes colliding and one of the aircraft coming down.

"There were some people in the paddocks at the back of this facility and there was also a helicopter in the air and we're working with them to get witness statements," he said.

Mangalore Airport is open to recreational flyers, those learning to fly and is also used by state and federal government departments.

With AAP.