Off-licences in areas of Sunderland have been urged not to sell alcohol to those under 21 at weekends.
The move comes after complaints about drink-related disorder in the Plains Farm, Silksworth, Doxford Park and Farringdon area.
So far 10 off-licences in the areas have pledged not to sell booze to people under 21 on Friday and Saturday.
Northumbria Police are urging a further nine off-licences in the area to sign up to the challenge 21 campaign.
It is illegal for those aged under 18 to purchase alcohol.
Sergeant Steve Lavelle, of the neighbourhood police team, said: "It's well known that youth disorder is often linked to alcohol and underage drinking, and while disorder has reduced in the area it continues to blight peoples' lives.
"We are determined to stop this and urging off licences not to serve alcohol to anyone under 21 each Friday and Saturday is just one of the steps we're taking."
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