A man has been arrested near Parliament Square after a member of staff at the tax office was attacked on their way into work.
Armed police who patrol the Houses of Parliament and surrounding government offices detained the man near Whitehall after reports from workers at HMRC.
Photos from the scene show the man forced onto the ground by two officers, while armed police stood guard.
Police arrested a man on the corner of Whitehall and Parliament Square this morning
Armed officers were called after a man reported attacked a member of HMRC staff
Police say the incident is not believed to be terrorism-related.
Armed officers were spotted at the scene as well as others who had arrived on police motorbikes.
The man was pictured on the floor, wearing a grey tracksuit and orange shoes close to the entrance to Westminster Station.