One moment the footage shows a typical and instantly recognisable London scene: red double decker buses travelling across Westminster Bridge in the heart of the British capital.
Latika Bourke London: When terror struck the British Parliament, the Commons was immediately suspended.
Josephine Tovey Police investigations are ongoing into an attack in London on Wednesday.
Kate Aubusson She's the scientist who was appointed as editor to almost 50 academic journals. Trouble is she doesn't exist
Nick Miller Front pages reflected a mood of shock at how close terror had come to the heart of its political life and history.
Nick Miller Terror attacks may have become easier. But society is now more resilient.
Nick Miller The terror threat level in the UK has been at severe - meaning an attack is 'highly likely' - since 2014.
Josephine Tovey, Georgina Mitchell, Nick Miller WORLD: Five people are dead after a 'terror incident' in central London.
Paul McGeough It was another extraordinary day in Washington as officials and public realise there are no brakes on this President.
Paul McGeough In keeping with the first days of spring, Tuesday is bright and sunny in Washington. But a "big, grey cloud" hangs over the White House.