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An envelope addressed to the White House and intercepted by U.S. authorities contained a substance identified as ricin, a deadly poison that appeared to have been sent from Canada, the Royal Canadian Mounted Police (RCMP) said on Saturday.

U.S. President Donald Trump on Friday said border restrictions between Canada and the United States because of the novel coronavirus pandemic would be lifted "pretty soon", just hours after the two countries confirmed they would remain in place until at least Oct. 21.

More than a thousand people gathered in central London on Saturday to protest against lockdown measures aimed at slowing the spread of the coronavirus, before the event was broken up by police.

Belarusian police detained hundreds of protesters in central Minsk on Saturday, a witness said, as around 2,000 people marched through the city demanding that President Alexander Lukashenko step down.

Russian opposition politician Alexei Navalny was seen walking down the stairs in a photo posted on his Instagram feed on Saturday, five days after a Berlin hospital said he had been taken off a ventilator and could breathe independently.

Innkeepers in Munich tapped their barrels on Saturday for revellers determined to make the most of a scaled-down Oktoberfest after the world's biggest beer festival was cancelled because of the coronavirus pandemic.