Soon after news broke about a mass shooting late Sunday at a country music festival on the Las Vegas Strip — which killed at least 58 people and left more than 500 injured — people from across the metropolitan area began flooding United Blood Services locations and the University Medical Center. Some people arrived before the locations even opened, showing up as early as 3:48 a.m. on Monday, according to reporter David Schuman of Las Vegas station KTNV.

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