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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More than 1,800 litter pickers will clear an estimated 57 tonnes of reusable items and half a million sacks of rubbish.
Time for Project Let's-Make-the-Best-of-it.
The Polish Embassy said it is "deeply concerned" by alleged incidents of abuse directed against Polish people after the Brexit vote.