Police chiefs have defending the actions taken by officers to keep revellers safe in night time Peterborough.
They say officers have excellent links with clubs and other nightspots and offenders are kept away.
A police spokeswoman said: “Police operate in the city centre on a Friday and Saturday night under Operation Themis where we carry out early intervention, proactive policing in order to deter alcohol harm.
“We work in partnership with Peterborough NightSafe (PubWatch) members and door staff to impact on alcohol harm and vulnerability.
“Most, if not all, city centre bars and clubs are signed up to an online system where images of people who have been excluded from premises are circulated to prevent crime.”
She said officers had recently met with members of NightSafe to discuss those causing problems over the Christmas period.
“As a result a number of other people had been added to the system to be circulated.
“If a person is arrested or identified as causing harm as a result of alcohol consumption in the city centre officers will send them a warning letter.
“If they are excluded from a premises, NightSafe will send them an exclusion letter.
“We believe that Op Themis is very effective in installing peace of mind and safety within the area, but ultimately the responsibility lies with the clubs, pubs and bars to ensure they carry out age verification checks and challenge drunk people at the door.
“Anyone causing problems inside is detained by door staff and should then be handed over to a police officer.