A 24-year-old man was arrested in connection with an assault at Folly Bridge yesterday.
Residents living near Donnington Bridge reported sightings of armed officers, a helicopter and police vans near the Thames.
It later emerged that Thames Valley Police had been investigating an assault.
Force spokesman James Williams said a man had been arrested in connection with the incident and was being held in custody.
Jane Madden, of Weirs Lane, said: “The police were everywhere and were stopping people from going down to the river.”
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