Another incident in Whitehall
http://www.bbc.co.uk/news/uk-39736733A man has been arrested by armed officers after an incident in Whitehall, near Parliament, police have said.
A witness described seeing two knives on the ground, one of which he described as a large bread knife.
A Metropolitan Police statement said there were no injuries.
Security remains tight outside Whitehall buildings following the terror attack on Westminster Bridge and the entrance to Parliament on 22 March.