A police officer can be seen in the live video feed from a camera worn by one of the climbers at the top of The Shard. It is not clear whether any of the protesters have been arrested.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.