A person has been killed and another is fighting for life after a car is believed to have swerved into fans outside a convention in Melbourne. 

The grey Toyota is understood to have mounted a curb where fans were standing outside the Supanova Comic Con and Gaming event at the Melbourne Showgrounds, just after 5pm on Saturday.

The car struck two pedestrians, with one who is yet to be identified dying at the scene, and another rushed to hospital with life-threatening injuries.

A witness, Tom, was leaving the convention with his wife and daughter when they saw a Toyota allegedly speed past them on Langs Road.

‘I heard a screech and a guy (allegedly) mounted the kerb at an erratic speed, hit a couple people,’ Tom told The Age. 

Tom then said the car did a U-turn before driving back down the street.

The driver then stalled, according to the witness, who attempted to perform a citizen’s arrest. 

The incident happened at the Melbourne Showgrounds, killing one and seriously injuring another

A number of SES tents were set up at the scene

The grey Toyota is understood to have mounted a curb where fans were standing outside the Supanova Comic Con and Gaming event at the Melbourne Showgrounds, just after 5pm on Saturday

‘He was erratic. ‘I said, “you’re not going anywhere mate”,’ Tom told the publication.

Victoria Police quickly arrived and arrested the driver.

Tom said his wife, who is a paramedic, worked on a victim who was allegedly hit by the car for 20 minutes before ambulances arrived.

‘He couldn’t move, but he was breathing,’ Tom said.

Police remain at the scene and a man has been arrested.  

‘Major Collision Investigation Unit detectives are investigating a fatal collision in Ascot Vale this afternoon,’ she said.

‘Police have arrested a man who will be interviewed by police. The circumstances surrounding the collision are yet to be established and the investigation remains ongoing.’

SES tents have meanwhile been set up. 

Victorian MP Jason Wood shared the news on social media.

‘My thoughts and prayers go out to the victims and their loved ones. This is very sad,’ Wood, a former cop and member of the Liberal party wrote.  

Supanova is a convention about science fiction and fantasy TV shows, comic books, gaming and collectables.

Police are urging anyone who witnessed the incident, have CCTV or dashcam vision or have any information, to contact Crime Stoppers.