Police have arrested a man over an alleged¹ assault on 2006 X Factor winner Leona Lewis at a book signing.

警察已经逮捕2006年英国偶像节目获胜者Leona Lewis新书签售会上进行袭击的男子。

A Scotland Yard spokesman said police were called to Waterstones book store at Piccadilly, London, but Lewis did not need hospital treatment.

Lewis's spokesman said the singer had been signing autographs（签名） for around 90 minutes when "a guy came up and punched（以拳重击） her to the side of the head".

The spokesman added that Lewis was "understandably badly shaken".

In a statement, Waterstones said: "There was an incident at our Leona Lewis signing this afternoon and the event was immediately stopped.

"We are now doing everything we can to support the police in their enquiries（询问）."

Lewis had been signing copies of her new autobiography², Dreams, which is due to be released next month.

One fan at the scene told the BBC: "My brother saw the whole incident. He [the attacker] walked up there with the book, she signed it and, as she looked up, he just punched her.

"He [my brother] actually heard the impact."

Another eyewitness³ added: "She was running out with her hand over her eye and I just saw a man on the floor.

"Suddenly the security all jumped on him and they were trying to pull him out and he was just laughing, he thought it was funny."

Lewis's spokesman added: "The police were called immediately and medical attention has been sought.

"Leona's understandably badly shaken and apologises to the fans she was unable to meet and complete signings for."

'Professionalism'

Waterstones said it took security at book signings "extremely seriously" and this was the first incident of its kind it had encountered.

"We would like to thank Leona for her professionalism and we are extremely sad that this event was ruined for her, and her fans, many of whom queued from the early hours of the morning to meet her," it added.

Lewis had been scheduled to appear on the BBC's The One Show on Wednesday night, however a spokesperson confirmed she had pulled out.

BBC sports presenter⁴ Gabby Logan was brought in to replace her.

Lewis's second album, Echo, is scheduled for release in November.

The three-time Grammy Award nominee⁵, released her debut⁶ single A Moment Like This, shortly after winning the ITV1 show.

She is due to play a gig in her native Hackney in east London on 2 November.