The Prime Minister’s Office has been placed under lockdown as police moved Downing Street staff into “secure rooms”.
A police cordon has been erected on Parliament Street this afternoon while officers investigate an “abandoned vehicle”.
Four police vans are also blocking the route to the official residence of Sir Keir Starmer.
Downing Street is closed in both directions between Trafalgar Square and Parliament Square.
A police cordon has been erected on Parliament Street this afternoon while officers investigate an ‘abandoned vehicle’
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It it believed that civil servants working inside government buildings in the area are unable to leave, and nobody is allowed to enter.
The Metropolitan police said the cordon has been put in place as a “precautionary measure”.
A spokesperson for City of Westminster Police said: “A cordon is in place at the southern end of Whitehall as a precautionary measure while officers investigate an abandoned vehicle in the vicinity of Downing Street.
“It is not linked to a separate road traffic collision involving a coach and a pedestrian in nearby Abingdon Street.”
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The lockdown follow a road traffic collision involving a pedestrian and a bus on nearby Abingdon Street earlier today.
The condition of the person is currently unknown, but is is believed they were trapped underneath the bus.
A London Ambulance Service spokesperson said: “We were called at 1.29pm today (June 11) to reports of a road traffic collision on Dean’s Yard, Westminster.
“We sent resources to the scene, including an ambulance crew, paramedics in fast response cars, an incident response officer and a clinical team manager. We also dispatched London’s Air Ambulance.
Police officer blocking the route to the official residence of Sir Keir Starmer
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“We treated a man for a head injury and took him to a major trauma centre by road.”
Both incidents have forced traffic to be halted in the area.
Emergency services are advising motorists to drive through the area if absolutely necessary.