11 Minutes

Twenty-two thousand fans are in Las Vegas for a celebration of country music. Headliner Jason Aldean launches into his first set - then the gunfire starts. Amid the confusion, groups of friends and families try to flee but get separated. An off-duty firefighter rescues the wounded as instinct takes over. Running left or running right could mean life or death.

A deluge of 911 calls causes concern that multiple shooters are on the Las Vegas strip. A Las Vegas Metro police officer drags his bleeding partner to safety. Between bursts of automatic gunfire, concertgoers make a run for it if they can. SWAT officers converge on the Mandalay Bay Hotel, where they now know the shooter is on the 32nd floor.

At overwhelmed local hospitals, doctors concentrate resources on treating the wounded most likely to survive. The lobby of the Tropicana Hotel looks like a disaster zone strewn with concertgoers seeking shelter. Country music superstar Jason Aldean, his wife and band members are hunkered down in a tour bus now full of bullet holes. As officials seek answers, the FBI joins the investigation.

Country music artist Dee Jay Silver reunites with his infant son, who was in a hotel room with his babysitter on the same floor as the shooter. Many survivors are still searching for closure. For some, the bond they formed that night with strangers is a silver lining, restoring their faith in humanity. For others, activism is a way to channel their grief.