There has been a loss of lives following the Russian plane crash, a source has told Interfax, though the number of victims has not been determined.
It is understood the plane was flying into Moscow from the Czech Republic.
Russia Today has reported the plane broke into three pieces after overshooting the runway upon landing.
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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.