Joe Biden is in Michigan while Donald Trump arrives in Pennsylvania, both key to the White House race.
A number of European countries are enforcing new measures as cases continue to rise.
The French president adds that he cannot accept that depicting the Prophet Muhammad justifies violence.
The Interior Ministry says a serious incident is under way in the French city.
More details emerge as a legal battle over the extradition of Meng Wanzhou continues in Canada.
Everyone in Slovakia over the age of 10 is to be tested for Covid – but the president is sceptical.
Rescue workers hunt through collapsed buildings in the city of Izmir after Friday’s deadly quake.
Non-essential shops will close until mid-December to help curb the highest infection rate in Europe.
Berlin’s new airport is finally opening to the public, 10 years behind schedule and billions over budget.
The Democratic and Republican rivals make ambitious forays into politically challenging territory.