People suspected of setting off a smoke bomb in a Norwich restaurant are being sought by police for theft after being accused of not paying their bill.

Police were called to Cosmo in London Street and 9.50pm to reports of a theft after it was discovered the bill had not been paid.

Police had not attended the scene immediately following the smoke bomb being set off.

A police spokesman said: 'It appears that the people who set off the smoke bomb did not pay their bill. The restaurant will be visited by officers where CCTV footage will be reviewed. Enquiries are ongoing.'

MORE: Smoke bomb set off in London Street, Norwich

Fire crews were rushed to reports of a building on fire last night, Monday, August 14, to discover it was a false alarm caused by the smoke bomb.

Diners were evacuated from the building after a green smoke bomb was found in the toilets at around 8.20pm.

Danielle Prostrollo was at the restaurant at the time.

She said: 'My friends and I figured it was a smoke bomb in the toilets because my friend was in there with her two kids and said there was green smoke coming from the bin.

'We left pretty quickly after we were evacuated from the restaurant.'

Witnesses say they saw a group of young people running out of the toilets moments before the alarm went off.

A crew from Carrow and a crew from Earlham Fire Station rushed to the scene at 8.42pm this evening.

No action was required from the crews.