A teenager needed hospital treatment after being stabbed in the stomach in Bicester last night.
Police and paramedics were called to Pembroke Way at 8.50pm.
The male teenager was taken to the John Radcliffe Hospital in Oxford for treatment.
A spokesman for South Central Ambulance said: "We attended the incident with police officers and an 18-year-old male needed treatment."
She said the extent of the teenager's injuries were not yet known.
Police arrested a 20-year-old man following the incident.
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