Racing commentator John McCririck has been taken to hospital after collapsing at Cheltenham Racecourse, a friend has told ITV News.
The friend said he will remain in hospital overnight but his condition is not serious.
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.