'We swear by almighty Allah we will never stop fighting you': What man holding bloody cleaver said after 'hacking soldier in Help For Heroes T-shirt to death just yards from Woolwich barracks'

The dramatic video obtained by ITV News emerged after terrified eyewitnesses saw two men shot by police marksmen following a machete attack on a serving soldier in Woolwich, south-east London. It is thought that the two men waited at the scene of the attack for 20 minutes until police arrived and then tried to attack them - but were swiftly shot by armed officers including a woman. They apparently shouted 'Allah Akbar', which means 'God is great' in Arabic, and tried to film the attack, the BBC's political editor Nick Robinson said. Theresa May tonight called a meeting of the Government's emergency Cobra committee in response and Prime Minister David Cameron has cancelled a meeting with French President Francois Hollande to return to London.