A man has been detained by armed police outside the Palace of Westminster.

A bearded man, wearing black trousers and a grey sweatshirt, could be seen being held against the fence with his arms behind his back by a police officer.

The incident is not thought to be terror related.

The Carriage Gates entrance to Parliament is closed.

Scotland Yard said the man - aged in his 30s - was arrested on suspicion of possessing a knife.

There are no reported injuries.

A Parliamentary spokesman said: "We are aware of an incident outside the Palace of Westminster, which is being dealt with by the Metropolitan Police."