A rap concert at the Brixton Academy in south London was called off last night after shots were fired inside the venue.

Nas, a US rapper married to the pop star Kelis, was performing on stage when the incident happened at about 10pm.

Scotland Yard said no one had been found injured and the venue was evacuated.

Nas was in Brixton for the finale of his UK tour promoting yesterday’s release of his double A-side single Just A Moment and No One Else In The Room.

A police spokeswoman said officers were called to Brixton Academy following reports of shots being fired inside the venue and people running away.

"We believe that two shots were fired towards the ceiling," she said. "Two bullets and two casings have been recovered from the scene. The performance was stopped immediately and the premises evacuated."

She added that police had not arrested anyone in connection with the incident and Operation Trident would be taking over the investigation. London Ambulance Service was also called.

Louise Kovacs, a Brixton Academy spokeswoman, said there was "a high level of security" at every event. More than 100 security staff were working at last night’s show and concert-goers passed through scanning and security checks at the entrance to the venue.

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