Paramedics were threatened at knifepoint in Didcot, when an ambulance was sent to Station Road.
The crew went to the scene at 1.40am on April 3 after a woman called to report a man had been injured in the street during a fight.
But when the crew arrived there was no sign of anyone needing treatment and the paramedics were threatened by at least two men brandishing knives.
The crew did not get out of the ambulance and called the police as they left the area. Thames Valley Police spokesman Victoria Bartlett said officers had searched the area but could not find anyone who might have been involved.
The incident is being investigated.
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