Westfield locked down after a man, 20, was stabbed in the face with the attacker on the run

A young man has been slashed in the face with a knife after a fight broke out at a Westfield shopping centre in Perth.

A scuffle kicked off between two men, one armed with a knife, at the Westfield Carousel Shopping Centre in the city's southeast at about 3.30pm on Friday.

A 20-year-old man suffered wounds to his face while the attacker fled the scene, leaving behind a knife which has been secured by police.

A WA Police spokesperson said officers are looking for the knifeman.

'There is no ongoing threat to the public or further cause for alarm,' they said.

'A number of police resources remain at the scene.'

Social media users reported that shoppers were locked down in the complex and 'told to stay quiet'.

One person claimed there was 'blood on the ground' and 'lots of police'. 

Footage shows dozens of shoppers locked down in Kmart as police remain at the scene.

More to come