Police are investigating a Snapchat video that allegedly shows a young female driver moments before she was killed in a horror head-on crash west of Sydney on Sunday.

Shania McNeill, 21, from Queensland, was killed when the Suzuki Baleno she was driving was involved in a head-on collision with a Nissan Micra at Berkshire Park.

Police are now investigating a Snapchat video that allegedly shows Ms McNeill in the driver’s seat, posing for the camera while the engine revs loudly and a passenger screams, “Shania!”.

Ms McNeill then momentarily changes expression from looking happy to looking scared and shocked before the camera pans to the ground and the video cuts out.

Oncoming headlights can be seen at the beginning of the video.

The video was posted to Snapchat by Ms McNeill’s friend Faeda Hunter who was a passenger in the Suzuki that crashed on Sunday, killing Ms McNeil and injuring five others.

To read the full story and watch the video visit The Daily Telegraph

The video has been shared on social media and was posted at about the same time the pink Suzuki collided with the Nissan Micra, according to The Daily Telegraph.

Assistant Commissioner Michael Corboy said the Snapchat video and photos the girls took of themselves in hospital following the fatal crash will form part of their investigation, according to 9 News.

Mr Corboy said the problem of people using social media like Snapchat while driving has become a dangerous trend.

“It’s not just young people — it’s right through the (age) spectrum,” he said.

“Any trend of going to video or Instagram or any of those social media platforms and sending out video or taping while you’re driving is a trend we’re really trying to stop.

“The message needs to get through that if you continue to do this, you or your friends could continue to die.”

“Our thoughts go out to that family — it must be terrible to watch that video and see that in the newspapers this morning,” he said.

“We really are calling on all witnesses or anyone who’s got dashcam footage to give it to police.”

Another driver, who had travelled on the road where the accident occurred, said he’d observed a car driving erratically before the crash. He said he and another motorist had been driven off the road by a car.

When police arrived on the scene at 1.15am, they found members of the public trying to assist victims from the two vehicles of the horror crash.

CPR was performed on Ms McNeill, but she died before paramedics were able to assist her at the scene.

Ms McNeill was in the Suzuki with two friends, Ms Hunter, 20, and Hazel Wildman, 23. Ms Hunter was trapped in the front seat of the vehicle and had to be freed by officers from Fire & Rescue NSW.

Ms Wildman, travelling in the back of the Suzuki, was able to free herself from the wreckage.

The driver of the Nissan, a 61-year-old man from Blaxland, and his front-seat passenger, a 39-year-old man from Cambridge Gardens, were also able to free themselves from their vehicles.

Ms Hunter and Ms Wildman returned to Snapchat the day after the accident and posted selfies from hospital.