COPS have swooped on a man just yards from 10 Downing Street after an "incident"at Horse Guards.
The 29-year-old has been arrested and is in custody after the "incident" in Whitehall, central London.
Cops have not revealed what the man has been arrested for.
There are no reports of any injuries and there is no known risk to the public, Met Police confirmed.
A number of government buildings – including the Ministry of Defence (MoD)- are at Horse Guards.
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The MoD have referred enquiries to the Met Police.
The area is also a stone's throw from 10 Downing Street and the Cabinet Office.
CCTV footage shows cops at the scene close to Trafalgar Square around 10.36am.
Forensic officers have also been seen putting items into clear plastic bags as they comb for evidence,
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Whitehall roads were closed between Trafalgar Square and Parliament Square as officers responded to the incident.
A Met Police spokesperson said: "Officers are assisting the MOD Police at Horse Guards following an incident earlier this morning.
"A 29-yr-old has man has been arrested & is in custody.
"There are no reports of any injuries & there is no known risk to the public.
"Further updates will be provided in due course."
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