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Shocking footage taken from inside Pulse nightclub in Orlando shows gunshots going off while partygoers are enjoying their night on June 12.
The video was uploaded to Snapchat by Amanda Alvear, 25, who was among those who lost their lives in the deadliest mass shooting in the United States.
Officials say Omar Mateen, 29, opened fire in the gay Florida club and was armed with a Sig Sauer MCX assault-style rifle and a handgun. Police say 49 people died in the shooting, plus Mateen, while 53 others were injured.
