Police have released disturbing CCTV showing a helpless Perth convenience store worker being punched and kicked by crowd of violent youths, who then flood the store and appear to carry out a manic stealing spree.

Video shows a 24-year-old worker follow a young man wearing a cap out of the store on in Wellington Street, who police say became aggressive when he was being served on on Monday 4 April.

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The offender can be seen throwing an unidentified object at the store window, and the attendant can be seen confronting him.

The man in the cap then walks aggressively towards the worker, discarding his jacket and launching himself on the worker, sending him scrambling backwards towards the store.

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Appearing to have stopped the man in the cap, now shirtless, against a wall, the worker is then targeted by a second man in a black singlet, who charges and corners him outside the store as numerous other young people flood towards the shopfront.

View photos Photo: WA Police More

The worker raises his arms in an attempt to protect himself from the vicious alleged assault as he is pushed inside the store.

The group can be seen charging inside, stealing and throwing items as the shirtless man pushes his way behind the counter, apparently throwing what appear to be boxes of cigarettes into the crowd from behind a roller door.

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