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The world is recoiling in horror at Sunday night’s (October 1) shooting at the Route 91 Harvest Festival in Las Vegas.

Jason Aldean was performing when a shooter fired multiple rounds, killing more than 50 people and injuring hundreds more, in what is being called the deadliest mass shooting in U.S. history.

Celebrities from all walks of life have taken to social media to express their sadness at what happened, including Aldean himself, who let everyone know he was okay, but that the incident “hurts my heart.”

Take a look below to see what other had to say.

Tonight has been beyond horrific. I still dont know what to say but wanted to let everyone know that Me and my Crew are safe. My Thoughts and prayers go out to everyone involved tonight. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night. #heartbroken #stopthehate

A post shared by Jason Aldean (@jasonaldean) on Oct 2, 2017 at 1:17am PDT

Please, if you are in Las Vegas, take cover there are multiple shooters on the loose, twenty people are dead. Find cover and hide.

— sia (@Sia) October 2, 2017

My heart is split open for the victims and their families in Las Vegas. At what point do we Americans say #enough

— Elizabeth Banks (@ElizabethBanks) October 2, 2017

My heart is breaking for everyone in Vegas tonight. Simply devastating. So much loss.

— Kelly Clarkson (@kelly_clarkson) October 2, 2017

My Las Vegas friends please stay safe, stay indoors. This is ongoing and looks already to be quite tragic.

— josh groban (@joshgroban) October 2, 2017

Lord help us

— Lil Chano From 79th (@chancetherapper) October 2, 2017

Condolences to all of those scarred by the violence in Las Vegas last night. We are with you.

— Stephen King (@StephenKing) October 2, 2017

heart goes out to everyone affected by the shooting in vegas, friends & families (strangers included)…breaks my heart to see earth like this

— Paris-Michael K. J. (@ParisJackson) October 2, 2017

Heartbroken by the news out of Las Vegas.
Praying for those of us waiting for news from loved ones who went to hear live music on a Sunday.

— Lin-Manuel Miranda (@Lin_Manuel) October 2, 2017

The news from Las Vegas is heartbreaking. Devastating.

— John Legend (@johnlegend) October 2, 2017

Too much to comprehend. These poor people. This poor country.

— billy eichner (@billyeichner) October 2, 2017

The news about Vegas is devastating. Sending all our love to the people there right now ❤️❤️❤️

— HAIM (@HAIMtheband) October 2, 2017

My thoughts and prayers are with you #StopThisHate #StopTheViolence

A post shared by Kate Hudson (@katehudson) on Oct 2, 2017 at 2:59am PDT

Horrified to hear about the shooting in #LasVegas. My thoughts are with the victims and their families. Praying for everyone's safety

— Mariah Carey (@MariahCarey) October 2, 2017

Oh God. Vegas. WTF is happening. Can’t keep up with all the pain this country is facing. Sending love to Vegas.

— bob saget (@bobsaget) October 2, 2017

I can't believe what just happened in Las Vegas! What is our world coming to?! My prayers go out to the victims & their families.

— Paris Hilton (@ParisHilton) October 2, 2017

Praying for all the innocent victims and their families in Las Vegas – Céline xx… #LasVegas

— Celine Dion (@celinedion) October 2, 2017

Can't believe my eyes. My prayers are with everyone in #Vegas. Please take shelter. This is unreal. praying for your safety.

— Christina Milian (@ChristinaMilian) October 2, 2017

Stars We Lost in 2017:

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