More than 22,000 people were gathered for a music festival Sunday night near the Mandalay Bay Casino in Las Vegas when a gunman began shooting, killing dozens and injuring hundreds.

>> Read more trending news

>> Las Vegas shooting live updates

In the wake of the attack, celebrities, elected officials and key figures have spoken out against the tragedy and offered condolences.

LAS VEGAS, NV - OCTOBER 01:  People scramble for shelter at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. A gunman  opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)

Credit: David Becker

icon to expand image

Credit: David Becker