At least one person killed as two planes crash at Belimbla Park in Oakdale in Sydney’s southwest

At least one person has died, with fears there may be multiple fatalities, following a light plane crash in Sydney’s southwest.

Two light planes collided midair then crashed at Belimbla Park in Oakdale about 11.50am on Saturday.

Two scenes have been established in the area, with paramedics and NSW Police currently on the scene.

Locals have reported seeing a parachute falling to the ground in the aftermath of the crash.

“Parachute was seen as plane nosedived into bush,” one local said on Facebook.

Police have confirmed the crash was fatal, but it is not yet clear how many people have died.

7NEWS understands there were reports of a “fireball”.

Fire and Rescue NSW Superintendent Adam Dewberry confirmed just after midday that FRNSW was responding to the incident.

“Members of the public are urged to avoid Oakdale in Sydney’s southwest and surrounding areas,” NSW Police said.

“An investigation into the cause of the crash will be undertaken by the Australian Transport Safety Bureau (ATSB).”

At least 11 ambulance crews and an aeromedical team were tasked to the scene.

The crash scenes are located near The Oaks airfield, where Sydney Recreational Flying Club operates.

It is unknown whether the planes were associated with the club.

Three crashes in mere days

Earlier on Saturday in Queensland, a seaplane crashed with five people on board, including its pilot.

The plane crashed in waters off Whitehaven Beach in the Whitsundays about 9am.

It reportedly “had an incident while operating which resulted in it flipping on to its roof”, emergency services said.

All five people safely evacuated the plane and were recovered by boat and taken to Hamilton Island Marina, where paramedics assessed them.

Two people sustained minor seatbelt injuries, and no one required hospitalisation.

7NEWS understands the passengers were visiting from Sydney, while the pilot is a Whitsundays local.

Earlier this week, a young pilot was killed in a plane crash about 50km northwest of Melbourne.

Jack Miller has been remembered as a “caring, kind-hearted” man.

The 20-year-old received his pilot’s licence earlier this year.

Minutes after take-off on Tuesday, Jack lost control of his Cessna 150 light aircraft and crashed into a paddock near Bacchus Marsh Aerodrome in Parwan.

He died at the scene, just a few weeks shy of his 21st birthday.