A 71-year-old woman has died after she is believed to have been mauled by dogs that she had gone to feed in Morden, south London.
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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.