Hearts are heavy all over the country, including in Hollywood, after two explosions went off during the Boston Marathon, killing two and injuring dozens of others in a number that keeps growing, according to CNN. As police investigate the bombs and who is behind this horrible act, celebrities took to Twitter to send their condolences to those in Boston on this day.

Lindsay Lohan: Sending prayers to everyone who was/is at the #bostonmarathon

Carson Daly: Praying for those hurt at #bostonmarathon – so terrible. 2 explosions at Finnish line. News is all over it. So sad

Courteney Cox: Prayers for Boston today

Lucy Hale: Sending prayers to Boston.

Chloe Moretz: Boston marathon, absolutely terrifying I hope everyone is okay

Kat Dennings: This is crazy. Glued to the TV, so scary. Thoughts and prayers with Boston right now.

Olivia Wilde: Oh for f*cks sake. I’m so disturbed by the reports from Boston. This is horrible.

Pink: Our thoughts and prayers are with everyone affected by the explosions in Boston.

Scotty McCreery: Prayers going out to everyone involved at the Boston Marathon.. #shocking

Anderson Cooper: Will be in Boston for tonight’s broadcast

Pete Wentz: Boston be strong.

Chris Evans: thoughts and prayers are with everybody in boston. heartbreaking…

Patrick Stump: Really awful stuff. Hope the injured are okay. Still information trickling. #prayforboston

Harry Shum Jr: This is terrible. #PrayForBoston

Eva Longoria: God be with the injured people! RT “@CNN: There has been at least one explosion near the Boston Marathon finish line http://say.ly/Oyb5Bfw

Lauren Conrad: My thoughts and prayers are with everyone in Boston today.

Lea Michele: Sending my thoughts and prayers to everyone in Boston right now….

Sophia Bush: I hope everyone in Boston is okay…

Nicki Minaj: My heart goes out to everyone who woke up this morning to enjoy a peaceful marathon but were met w/senseless destruction.

Channing Tatum: #prayforboston

Kylie Jenner: Sending prayers to Boston..

Zoe Saldana: My prayers and thoughts are with the victims who lost their lives today at the Boston marathon. Que Dios los tenga en su gloria. ZS

Kelly Ripa: #prayforboston

Alicia Keys: Shaken… My thoughts and prayers are with the city of Boston and those affected by this tragedy.

Sarah Hyland: I’m so shocked to hear about the bombings at the #BostonMarathon #prayforboston

Colton Haynes: My thoughts and prayers go out to those effected in the Boston Marathon bombings #prayforboston

Ariana Grande: #prayforboston so sad I have no words. Stay safe everyone. Prayers and love.

Jenna Dewan: Oh man. Just heard the news about Boston. This is just awful. #prayforboston

Justin Timberlake: My thoughts and prayers are with everyone in the city of Boston and all of those affected by this terrible incident.

Kaley Cuoco: #Boston prayers are with you

Kelly Osbourne: Praying for #Boston

Josh Duhamel: Thoughts & prayers go out to Boston. #prayforboston

Peter Facinelli: Boston Marathon bombing? Why? Horrible. Just horrible.

Kate Walsh: I just heard about Boston. My prayers are with you, and am deeply saddened, god bless everyone

Zachary Quinto: all love to boston.

Emmy Rossum: If you’re in Boston and can donate blood, here are the locations: http://www.redcrossblood.org/MA

Ellen DeGeneres: Let’s all send our thoughts, our prayers and our energy to the people injured in Boston. My heart is with you.

Khloe Kardashian: So many unspeakable tragedies! My heart, love and prayers go out to anyone affected by the sad events in Boston. #PrayForBoston

Kris Jenner: #prayforboston

Kendall Jenner: #prayforboston

Kim Kardashian: My heart is breaking for everyone effected or injured in the explosion at the Boston Marathon. God bless you all! My prayers are with you!

Simon Cowell: Watching the news. Horrendous. Please god no more bombs. Stay safe America.

John Krasinski: My heart and my prayers are in Boston and with everyone affected by this nightmare of an incident.

Ed Sheeran: #prayforboston

Ke$ha: My heartfelt love goes out to those affected by today’s tragedy in Boston. All of our thoughts are with you. #loveintothelight

Ashley Benson: Praying for loved one in Boston so horrible.

Jesse Tyler Ferguson: ‏All my thoughts are with #Boston.

We send our thoughts to all those in Boston during these tragic events.