For the second time in two matches, Canadian curler Marc Kennedy has been accused of cheating by an opponent at the Winter Olympics.

The 44-year-old - who won gold in 2010 and and bronze four years ago - became involved in a heated verbal exchange with Sweden opponent Oskar Eriksson towards the end of his side's 8-6 win on Friday.

The Swedes believed Kennedy was repeatedly double-touching some of his stones - releasing the handle at the appropriate time but then giving the stone another little prod with his finger to correct its course - with TV pictures appearing to show that he did indeed touch the stone on occasion.

That led World Curling to announce that they would deploy extra officials for the remainder of the Games to check for such infractions - a departure for a sport that is self-governed by the players.

However, when the Canadians returned to the ice on Saturday to face Switzerland, controversy flared around Kennedy again, with the Swiss reporting him to the umpire for the same offence in their 9-5 win.

"I saw [Kennedy do it] when the referee was next to me," Swiss lead Pablo Lachat-Couchepin told BBC Sport.

"I really believe it does nothing - it doesn't change the stone - but when you have a referee looking at it, they should see it. "I was a bit annoyed and said to the chief umpire if they send an email they have to follow what it says. It's nothing against Marc but you have to follow the rule. " After the initial accusation, Kennedy - who was later given a warning for using foul language - said: "I don't like being accused of cheating after 25 years on tour and four Olympic Games So I told him [Eriksson] where to stick it. "He might have been upset that he was losing

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