Can robots ever be graceful?
Kevin Church/ BBC News
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Video evidence examined by the BBC reveals that 17-year-old Shreeyam Chaulagain - the youngest of the 19 victims - had been unarmed and was trying to leave the scene when he died.
Security officials "hugely underestimated the crowd", says Basanta Basnet, editor of Nepal's daily online news portal Online Khabar. "I spoke to security personnel, and also to members of the political class - they said that 'children' were joining."