The detained terror suspect has been named as Khalid Mohammed Omar Ali, a British citizen who was born overseas but went to school in Tottenham, north London.
Photos showed a huge number of armed police at the scene, close to Theresa May's ministerial offices and just 100m from Downing Street. Close to Parliament Square and the scene of last month’s terror attack by Khalid Masood.
A man has been arrested in Whitehall this afternoon, at approximately 14:22, following a stop and search as part of an ongoing operation.
The 27-year-old man was arrested in Parliament Street, junction with Parliament Square, by armed officers from the Met's Specialist Firearms Command.
He was arrested on suspicion of possession of an offensive weapon and on suspicion of the commission, preparation and instigation of acts of terrorism. Knives have been recovered from him.
He is being detained under the Terrorism Act and is in custody in a south London police station.
Detectives from the Counter Terrorism Command are continuing their investigation, and as a result of this arrest there is no immediate known threat.
Images from the scene showed three knives on the ground close to a brown rucksack.
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