Yet another mass shooting in the United States... and this one's the worst. Dozens have been killed at a country music concert by a man shooting from the window of a Las Vegas casino hotel. An "act of pure evil", according to US President Donald Trump. We take a look at the circumstances, and what we know so far about the 64-year-old local resident who turned one of his semi-automatic weapons on himself after at least ten minutes of carnage. Produced by Charles WENTE, Maya-Anaïs YATAGHENE and Van MEGUERDITCHIAN.