ARMED police were reportedly spotted in Barton, Oxford, yesterday on a 'big' police operation.

Onlooker described seeing 'armed police everywhere' as well as riot vans about 3pm.

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Thames Valley Police confirmed it was following up sightings of a male wanted in connection with drug offences.

Officers swooped in on the area to search for the male.

The forced said it arrested a 17-year-old boy, from Didcot, on suspicion of possession of a class A drug with intent to supply.

Police said the boy remains in custody at this time.