Avon and Somerset Police Inspector Paul Winship dismissed the suggestion that a police vehicle may have been in pursuit of the BMW as it crashed through iron railings in Bristol city centre into the river.
"I can confirm this was a straightforward accident involving a single car going off the road," he said. "It was not a pursuit, and so the Independent Police Complaints Commission has not been informed."
More top news
Scotland Yard say a 73-year-old man has been arrested in West Sussex on suspicion of sending offensive messages on social media.
Ian Stewart, the fiancé of children's author Helen Bailey has been found guilty of her murder.
Actor Harrison Ford had a near miss at a Californian airport after landing a plane on a taxiway.