Communities and peer groups "hold the key" to stopping young British men and women from fighting in Syria, a leading MP said.
Keith Vaz warned Good Morning Britain young people were "recruited on their telephones" and in order to stop them travelling to Syria or Somalia, then peer groups needed to be vigilant.
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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.