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We have the latest on the investigation and we ask whether the suspected suicide attack was a 'payback' for Russia's involvement in Syria. The Egyptian president gets a warm welcome in the White House - we examine what lies behind the rapprochement between Cairo and Washington. We hear about efforts to find survivors and to help those who've lost their homes in a mudslide in the Colombian town of Mocoa. And we report from Finland on an experiment with giving a random group of people a fixed sum of money. (Picture: Damaged train carriage in St Petersburg Credit: AFP/Getty Images).