ITV News has obtained footage of a man with bloodied hands and carrying knives speaking into a camera in Woolwich.
He made a series of political statements.
"We swear by almighty Allah we will never stop fighting you," he said.
ITV News has uncovered a video showing Woolwich suspect Michael Adebolajo speaking at a demonstration at Harrow Central Mosque in 2009.
Documents suggest Security Services were trying to recruit Woolwich suspect Michael Adebolajo and had also approached members of his family.
Police in Kenya say they did everything they could to highlight their concerns about Michael Adebolajo.