"The reason why happened this crash, we don't know right now, we need investigations, but it's a big tragedy, and also three children died," says Kyiv mayor, Vitali Klitschko, in Davos, Switzerland about the helicopter crash in the town of Brovary, outside Kyiv, that killed at least 16 people, including Ukraine's interior minister Denys Monastyrsky. SOUNDBITE

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