The incident occurred at Culham Lock yesterday (Monday, April 6) with initial reports suggesting police were on the scene from about 7.30am.
Manned police cordons were set up around all entry and exit points to Culham Lock car park, and eyewitnesses say at least four police cars or vans remained there for most of the day.
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Blue tents were also set up by police in the car park, in the bottom left corner.
One person who lives in Culham said they saw the incident was ongoing in the car park at about 3.30pm.
They said: “The incident seemed to be located in the back half of the car park on the left side.
“There seemed to be a lot of locals stood around staring and the lock keeper was stood with his hands on his head.”
They also reported seeing a recovery van retrieving a black four-by-four from the scene. It is not yet known if this is related to the incident.
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The eyewitness said all emergency vehicles had cleared from the scene by about 4.30pm on Monday.
Thames Valley Police has not yet provided a comment on this incident, despite multiple attempts by this newspaper.
Culham Lock is an historic waterway cut to the north of the River Thames, with a free car park which provides a popular walking route along the river and through villages like Culham and Sutton Courtenay.
