A man is undergoing surgery after he was seriously assaulted.
The 23-year-old man was travelling in a van when he was attacked by a man from another vehicle.
The victim was taken to hospital where he was kept in overnight and is due to undergo surgery this morning.
Police cordoned off the area after the assault at about 4pm yesterday in Vellum Drive, Carshalton.
A spokesman said: "If you have any information that could help us with our enquiries, please contact Det Con Paul Keevill at Sutton CID on 020 8649 0747.
"Alternatively, you can contact Crimestoppers anonymously on 0800 555 111."
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