LAS VEGAS, Nevada (WPVI) -- Here's a look at the timeline of events as the worst mass shooting in U.S. history unfolded in on the Las Vegas Strip.
Country music star Jason Aldean was headlining the evening's concert lineup and was onstage when the shooting began.
10:08 p.m. PT - First call to dispatch for reports of shots fired at the Route 91 Harvest Festival outside Mandalay Bay Hotel and Casino on the Las Vegas Strip
10:40 p.m. PT - Alert about an active shooter hits the news wires
11:08 p.m. PT - Las Vegas police shut down a portion of the strip
11:20 p.m. PT - Reports of multiple injured people taken to area hospitals
11:32 p.m. PT - Some flights destined for the McCarran International Airport diverted
11:34 p.m. PT - Portion of Interstate 15 closed
11:56 p.m. PT - Las Vegas hospital says at least 2 dead, 24 injured, 12 critical
12:01 a.m. PT - Las Vegas police say one suspect is 'down'
1:06 a.m. PT - Southern California police department says off-duty officer among those shot
1:32 a.m. PT - Las Vegas sheriff says officers killed gunman on 32nd floor of Mandalay Bay Hotel and Casino
1:34 a.m. PT - Death toll jumps. Las Vegas sheriff says at least 20 people dead, 100 injured
1:54 a.m. PT - Las Vegas police say two off-duty officers among those killed
2:05 a.m. PT - Nevada sheriff says one on-duty officer in critical condition, another wounded
2:13 a.m. PT - Police looking for roommate of shooter as person of interest in attack
2:30 a.m. PT - Jason Aldean sends out Instagram message confirming he and band are safe
3:30 a.m. PT - Las Vegas sheriff says at least 50 dead, more than 200 injured in attack
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