The alleged shooter died of a self-inflicted gunshot wound, according to police.
Immediately after the news broke out, celebs — including several famous YouTube stars — took to Twitter to comment on the tragedy.
Marjory Stoneman Douglas High School students — who survived their own horrific shooting on February 14 — also gave their two cents about the heartbreaking news.
See all the reactions (below):
Mr. Trump, you know in your heart that no one needs or wants your “thoughts and prayers”…what people long for is to feel safe and secure in their schools and workplaces and houses of worship. You nearly stood up to the NRA. What changed your mind?? https://t.co/CoUdguVmdm
├óΓé¼ΓÇ¥ Bette Midler (@BetteMidler) April 3, 2018
Unbelievably upset & sick..
YouTube HQ.. my thoughts & prayers go out to the amazing team there.. I hope you all stay safe. No one should have to go through something so horrific.
I have been inside that exact building & it├óΓé¼Γäós scary to even say that..
We need change├óΓé¼┬ªnow!
├óΓé¼ΓÇ¥ Jake Paul (@jakepaul) April 3, 2018
omg. i just opened twitter and saw what happened. please everyone at hq stay safe :((
├óΓé¼ΓÇ¥ Shane Dawson (@shanedawson) April 3, 2018
I├óΓé¼Γäóm hoping for a hasty recovery, both in body and mind, to all affected by the shooting at YouTube HQ today and hoping for gun control soon so events like today are far less likely to keep happening.
├óΓé¼ΓÇ¥ Thomas Sanders (@ThomasSanders) April 3, 2018
I don├óΓé¼Γäót even know what to say anymore about shootings, but this one hits close to home. Praying that my friends over at YouTube HQ are okay
├óΓé¼ΓÇ¥ Jenn McAllister (@jennmcallister) April 3, 2018
My heart just dropped after hearing about the shooting at YouTube HQ… praying for everyone involved and their safety. It├óΓé¼Γäós not fair that we can├óΓé¼Γäót feel safe anywhere anymore…. 🙁
├óΓé¼ΓÇ¥ Catherine Paiz (@CatherinePaiz) April 3, 2018
Horrified by the shooting at YouTube HQ today. I will never understand how such horrible people exist in the world.
├óΓé¼ΓÇ¥ Lily Marston (@lily_marston) April 3, 2018
Stoneman Douglas High School students:
Not even two months after what happened at our school. Not even a month after what happened at Great Mills. But this time, it├óΓé¼Γäós not a school.
My heart goes out to those in the YouTube shooting, I├óΓé¼Γäóm so sorry, this should have never happened, I promise we├óΓé¼Γäóre going to fight for you.
├óΓé¼ΓÇ¥ Sarah Chadwick// #NEVERAGAIN (@Sarahchadwickk) April 3, 2018
Concerts. Airports. Movie Theatres. Shopping areas. Churches. Schools. And now work places… This is an American problem. People of @YouTube, we are with you. #NeverAgain https://t.co/tW3hDFzD7e
├óΓé¼ΓÇ¥ Carmen Lo // #NEVERAGAIN (@xo_karmin_ox) April 3, 2018
Our hearts are with you Youtube.
Stand strong, while we stand up for change.
Enough is enough.
├óΓé¼ΓÇ¥ Delaney Tarr (@delaneytarr) April 3, 2018
[Image via YouTube.]