The killing of a policeman and his partner near Paris on Monday night was a "terrorist attack", a French government spokesman has said.
Islamic State's Amaq news agency said one of the group's fighters was responsible for the killing.
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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.