Twelve people have been shown yellow cards for anti-social behaviour in Brighton and Hove since a new scheme was launched.

The offenders have been warned: "One more time and you will be banned."

The crackdown is part of the Enough Is Enough campaign launched by the Chief Constable Ken Jones to tackle alcohol-related violence and antisocial behaviour.

The scheme, launched last month, introduced an exclusion notice to ban those who persistently cause trouble in West Street and the surrounding streets from entering any of the licensed venues.

On the first offence, trouble-makers are issued with yellow cards and their details are passed to the Business Crime Reduction Partnership (BCRP) and Sussex Police.

If the person offends for a second and third time and is issued with another yellow card, this will result in an exclusion notice being served and a ban from all licensed premises which are members of the scheme.

A Force spokeswoman said: "Offenders will be captured on CCTV and their photographs circulated to participating venues.

"People able to issue the yellow cards include Police Community Support Officers, licensees, door supervisors and police officers.

"Any breach of the exclusion notice will be referred to the City's Antisocial Behaviour Team for consideration of an Anti-social behaviour order (Asbo) which could result in a prison sentence of up to five years and/or a fine."

Terry Davies, from the BCRP, said: "The BCRP has a very successful exclusion notice scheme operating across our 300 members which has proved very useful in coercing offenders into rehabilitation.

"This new yellow card scheme is available to our 100 members who are licensees and will assist to identify offenders who are involved in mainly violent crime.

"Prolific offenders will be identified and could find themselves with an Asbo and potentially five years in prison if they don't rationalise their use of alcohol and curb their violent behaviour."

Julia Wyborn-Dore, Violent Crime Reduction Officer for Brighton and Hove Police, said: "People must take responsibility for their actions.

"Violence associated with alcohol consumption and antisocial behaviour will no longer be tolerated - it is unacceptable to those who frequent the city centre and those who work in it.

"This scheme has been successful in many other towns across the country and we look forward to seeing the same results in Brighton.