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.
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