ITV News correspondent Nick Wallis has tweeted pictures of the disruption caused at London City Airport on Tuesday morning.
He said passengers have been told "not to enter" the terminal and added "no flights arriving or leaving" after protesters locked themselves together on the runway.
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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.