The London Olympics have been named the most sustainable Games ever by an independent watchdog. The Commission for a Sustainable London 2012 praised the Games' recycling and transport policies - and said they could provide a model for future sports events.
More top news
Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.