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WATCH LIVE: Authorities provide update on Las Vegas shooting investigation

Clark County Sheriff Joe Lombardo (C), flanked by Las Vegas Mayor Carolyn Goodman (L) and U.S. Rep. Dina Titus (D-NV), speaks during a news conference on October 2, 2017 in Las Vegas. (Photo by Ethan Miller/Getty Images)
Clark County Sheriff Joe Lombardo (C), flanked by Las Vegas Mayor Carolyn Goodman (L) and U.S. Rep. Dina Titus (D-NV), speaks during a news conference on October 2, 2017 in Las Vegas. (Photo by Ethan Miller/Getty Images) (Getty Images)

Officials in Las Vegas will hold a news conference at 4 p.m. at police headquarters to provide an update on the investigation in the mass shooting.