Liam Byrne, Shadow Secretary for Work and Pensions, said the real concern he had from the unemployment figures is that "there are now very clear signs of lasting and long term damage that's come from the Government's failure to get people back to work fast enough".
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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.