Social workers will join police in a crackdown on under-age drinkers in Manchester city centre tonight.

They will be trying to identify young people vulnerable to exploitation because of booze.

Social workers from Manchester council will provide on-the-spot assessments and offer support to any vulnerable child approached by police in problem areas like Piccadilly Gardens.

The action could range from calling parents or giving healthcare advice to directing them to children’s services or charities such as Barnardo’s.

It is the first time this direct tactic has been used in the city centre. And Coun Pat Karney, lead member for the city centre, said: “The police and socxial work staff have the best interests of these young people at heart.”

The initiative is part of a police crackdown on alcohol-related crime, which was expected to include raids in every division of Greater Manchester today. Officers are hunting suspects of booze-fuelled violent assaults and criminals who have jumped bail and are on the run.

The operation, codenamed Portcullis, will see ‘safety arches’ – airport-style metal detectors – used in the city centre throughout the night to catch people carrying knives and other weapons. Sniffer dogs will also be out to catch people with illegal substances. GMP officers will be checking licensing agreements are being adhered to.

Assistant Chief Constable Terry Sweeney said: “All too frequently, alcohol is a major cause of aggression and results in innocent people being subjected to violent and unprovoked assaults. Manchester was recently awarded a purple flag for safety. We want to keep it that way. Not only are we removing trouble-makers from the streets, but we’re also encouraging people to look after themselves by pacing their drinks, staying with their friends and using safe transport.

“My message is simple: I don’t want to see anyone spoiling everybody else’s fun by being drunk and causing trouble. If you do see trouble, walk away.”

Coun Jim Battle, the council's deputy leader, said: “This operation sends out a really strong message to that minority of people who are bent on trouble.”

Click here for live coverage of today's Operation Portcullis raids