18-year-old Gaby Scanlon remains seriously ill in hospital after drinking a cocktail with liquid nitrogen. Doctors were forced to remove her stomach to save her life.
Police say her condition is serious, but stable, and she appears to have been well enough to send a tweet from her bed.
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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.