Two stores were caught selling drinks to 15-year-old children in the latest of a series of undercover police operations.
Police carried out test-purchasing at seven off-licences and corner shops in North Oxford on Friday night.
Nine to Nine convenience store in Banbury Road was caught selling alcohol to children and will face prosecution by police.
A member of staff at BP petrol station, off the Wolvercote roundabout, was fined £80 for supplying alcohol to 15-year-olds.
Anyone with information on the sale of alcohol to underage shoppers should contact police on 08458 505505 or Crimestoppers on 0800 555111.
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