A man claims he was Tasered by police nine times after he was seen playing with a toy gun he bought for his son.

Justice Livingstone was shot with stun guns at Norwood Junction, just before 11am on November 14, but the Metropolitan Police say they fired Tasers five times.

Armed officers stormed a crowded train at the station after receiving reports a man dressed like a cowboy had a gun.

Mr Livingstone told the Guardian he had bought the toy firearm for 99p and was going to give it to his son.

The father-of-two said he was sitting on the train when he first saw the officers.

"I was sitting reading the FT when these four officers rushed onto the carriage."

As Mr Livingstone went to leave the train he was told to "Sit down."

He added: "I sat down patiently. They said 'Open your briefcase,' which I did. They saw the toy gun, then a male officer opened fire with a gun which jammed.

"So then they jumped at me and used the Taser four times at my chest. That did not have any effect, I felt no current.

"They then held me down grabbed on to my head and pinned me down and shot me in the back of the head with the Taser three times and I felt the current.

"They tied my legs and took me off the train to the platform."

Mr Livingstone was taken to a police station in Victoria, where he claims officers made fun of the long trench coat and black hat he was wearing.

He was sent to Bethlem Royal Hospital, Beckenham, where he was sectioned under the Mental Health Act, but he claims he has no history of mental health problems.

A spokesman for the Metropolitan Police said: "Attempts by the officers to physically restrain him failed so they deployed Taser.

"The man was Tasered a number of times but this seemed to have no effect.

"Eventually, officers were able to physically restrain him the man and he was removed from the train and into the custody of British Transport Police."

Mr Livingstone has said he will be making an official complaint.