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This Snapchat video purportedly shows the horrifying moment gunshots rang out inside the Pulse nightclub in Orlando as terrorist Omar Mateen carried out his massacre.
The brief video clip was posted on Facebook by a man who claimed it was recorded by his friend, Amanda Alvear, who was one of the victims of the worst mass shooting in U.S. history.
Footage shows a close-up of a woman, who appears to say the word 'shooting' before several loud bangs are heard.