ITV News has uncovered a video showing Woolwich suspect Michael Adebolajo speaking at a demonstration at Harrow Central Mosque in 2009.
The event was organised as a counter-rally against a planned protest by the English Defence League.
In the footage Adebolajo can be heard saying:
"Don't be scared of them, do not be scared of the police or the cameras. You are here only to please Allah. You're not here for any other reason, if you are here just for a fight, please leave our ranks. We only want those who are sincere to Allah. Purify your intention."