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The number to call to check on someone in Las Vegas

LAS VEGAS — At least 50 people are dead and more than 400 others injured after a gunman opened fire at a music festival in Las Vegas, in the deadliest mass shooting in modern U.S. history.

Anyone concerned for the safety of a loved one can call 866-535-5654 for information on their safety, according to local officials.

Police later released a new number for calls: 1-800-536-9488.

The exact number of people dead and injured is not yet known, but at least 50 were killed and 400 other injured, Clark County Sheriff Joseph Lombardo said at a morning news conference.

Stephen Paddock opened fire Sunday evening at a country music festival, Lombardo said. Paddock was confronted and killed himself, and another person of interest has been located.