BBC News 24 reports:
Whitehall was closed off , then reopened,. Now there is another incident in Whitehall, with one man near the Ministry of Defence, opposite Downing Street, being arrested in handcuffs, and taken into Ricchmond House (Department of Health) by armed police.
Apparently no weapons or bags etc - was this just someone demonstrating or shouting in public near Downing Street ?
For no good reason the Police have just asked the trusted BBC news team in Downing Street (i.e. behind the Gates) to turn off their cameras !