A man is in a serious condition in hospital after being stabbed in the neck at an event attended by singer Jessie J.
Police were called to the event hosted by Rim at Bankside Vaults nightclub in Southwark, Central London, shortly after midnight.
Jessie J had earlier performed at the event to promote BlackBerry’s instant messaging service.
A spokesman for Research in Motion (RIM), said:
“Our first concern is the well-being of the individual concerned.
We are doing all that we can to assist the police with their inquiries.”
The Brit-award winning singer, Jessie J, had earlier sang at the event. The shaken performer posted her condolences on Twitter today.
The party was attended by journalists, celebrities including rapper Wretch 32, Lauren Goodger, Lydia Bright and Joey Essex of The Only Way Is Essex.
BlackBerry competition winners also mingled with X-Factor judge Tulisa Contostavlos ex-boyfriend N-Dubz rapper Fazer, Nicola McLean, Lizzie Cundy and Jessica Jane Clement.
Hundreds of revellers were kept inside the club while police investigated the incident.
Everyone tried to leave at the same time but the organisers weren’t geared up for it and there was a huge rush to get to the cloakroom.
“People were crying and quite a lot were being sick, whether from the blood or the alcohol. A lot of people here were teen users of BlackBerry who don’t seem to have had a free drink before.”
A Scotland Yard spokesman said:
“At around 12.07am the ambulance service called police regarding a man injured in a club off Southwark Street.
He is thought to be in his 30s and has been taken to hospital in a serious condition.
The victim is thought to have been injured with a bottle. One man has been arrested and is in custody.”
Scotland Yard said the 25-year-old suspect had been arrested on suspicion of assault and is in custody at a south London police station.
The injured man was being treated in an east London hospital, the force said.