Wikileaks say they are set to release a statement from US fugitive Edward Snowden shortly.
The group said "press reportage should be treated with caution" until Snowden's statement is released.
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A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.