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A man has been arrested on suspicion of causing grievous bodily harm (GBH) after a man was stabbed close to the British Museum.
The man was stabbed in the arm at the junction of Great Russell Street and Museum Street at about 10:00 BST. He was taken to hospital by paramedics.
The museum was evacuated of visitors and remains "temporarily closed".
There is "no outstanding risk to the public" and it is not being treated as terror-related, the Met Police says.
A police cordon includes streets close to the museum, with tape also blocking off The Plough pub on the junction of Little Russell Street and Museum Street.
A 27-year-old American woman said she was about to enter the queue at the British Museum when she was told to leave by police because someone had been stabbed.
The visitor, from New York, was leaving a Starbucks directly across from the museum on Great Russell Street when police approached her.
"A cop directly in front of us told us we needed to leave and that the crime scene was large," she said.
"I heard that someone was stabbed and the ambulance was parked inside, near the grass area, and then rushed down the street, right by me, with police following behind," she added.
London Ambulance Service said: "We treated a man at the scene for an arm injury before taking him to a major trauma centre as a priority."
A museum spokesperson said: "We will update visitors as soon as we are able to reopen."
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