Police have been called to the Palace of Westminster after a man was seen climbing up the tower which houses Big Ben.
Video on social media shows a barefoot man stood on a ledge several metres up the Elizabeth Tower holding a Palestinian flag.
A Met Police spokesperson said: “At 7.24am on Saturday March 8 officers were alerted to a man climbing up the Elizabeth Tower at the Houses of Parliament.
“Officers are at the scene working to bring the incident to a safe conclusion. They are being assisted by the London Fire Brigade and the London Ambulance Service.”
Bridge Street, which is at the north end of Westminster Bridge, has been closed to allow the emergency services to deal with the incident, police confirmed.
A spokesman for London Fire Brigade (LFB) said firefighters are responding to the incident alongside police.
Crews from Lambeth, Chelsea, Soho and Islington fire stations have been deployed, LFB added.
At least nine emergency service vehicles have lined the street in central London as crowds look on from beyond a police cordon.
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