Protesters are making their voice heard at the gates of Bradley Manning's Court Martial in Fort Meade, Maryland. They want him to be freed from custody, claiming that no one has been hurt by the leaking of information.
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Nearly 1,000 properties have been left without power, and road users have been warned of potentially hazardous conditions.
It follows a surprise summit between South Korea's Moon Jae-in and the North's Kim Jong-un.
Organisers issued a warning about a “dangerous high strength or bad batch substance on site”.