Moment bystander was attacked by crazed dog at London train station 

This is the horrifying moment a man who had bravely intervened to stop a ‘berserk’ dog from attacking commuters in South London is mauled by the savage animal as it turns on him.

Video filmed by locals in flats overlooking New Malden railway station in Kingston-upon-Thames shows the moment the ‘irresponsible’ dog owner lets go of one of her leads as it tears free from her grasp.

Witnesses said a man in a vest tried to restrain the animal as it attacked another person at around 6.45pm on Friday.

He then tried in vain to escape but was caught by the dog which clamps onto one of his thrashing legs. Eventually he managed to grab hold of the leash and get his knee on the beast’s back to subdue it.

The man had initially intervened to stop the dog from from attacking commuters around New Malden station in south London

But the savage animal then turned on him, with footage of the horrifying incident from flats above

The dog attack took place at New Malden railway station in Kingston-upon-Thames, London

Officers seized the dog following the attack, and its 22-year-old owner was arrested on suspicion of being in charge of a dog dangerously out of control. She was released and remains under investigation.

British Transport Police (BTP) said two people suffered injuries in the attack, with one hospitalised and needing stitches to their arms and legs.

A witness told The Evening Standard: ‘I had another neighbour say that these same dogs have attacked a little dog in Beverley Park in the past so this didn’t seem the first incident.

‘Their owner should have them muzzled if that was true. The owner was irresponsible, it doesn’t look like the dogs have any training at all.’

A BTP spokesman told MailOnline: ‘British Transport Police were called to New Malden railway station at 6.42pm on 20 May following reports of a dog attacking members of the public.

‘Paramedics also attended and one person was taken to a local hospital for treatment, he has since been released after receiving stitches. A second person was treated at the scene for minor injuries.

‘A 22-year-old woman was arrested on suspicion of being in charge of a dog dangerously out of control and conveyed to police custody. She has been released under investigation.’