What should have been a joyful day in Boston was shattered when explosions went off near the finish line during Monday’s marathon. The shock and horror could be felt on Twitter, where timelines were filled with prayers, sadness, and heartfelt messages.

As news of the horrific events broke, Boston native JoJo cried out for her beloved hometown, while Nicki Minaj’s heart ached for the innocent victims. Machine Gun Kelly couldn’t comprehend the senseless act of violence, and Alicia Keys was shaken by the tragedy.

Read some of the reactions from social media below.

Beyoncé: My heart and prayers go out to Boston

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

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

Rick Ross: Prayers go to #Boston

Big Sean: Those bombs going off in Boston are devastating… The guy I was sitting next to on the plane said his friends were running in the marathon. That’s horrible that happened on a day like this, at an event like that. #prayersup

Miguel: Get well wishes to all those injured/effected by today’s marathon bombing

Ameriie: My heart hurts. #prayforboston

JoJo: Just got out of yoga and had a dozen text messages… My heart dropped. Please #PrayForBoston. My Home. My family and dearest friends.

Ciara: So Sad to hear about what has happened in Boston as I board my flight☹ this is truly unbelievable! Prayers to those lost and affected:( ♥

Lil Wayne: Prayers for Boston

Skylar Grey: Horrible news about the Boston Marathon bombings… My thoughts and prayers are with those lost and injured.

Lil’ Kim: I just heard about the bombs at the Boston Marathon. What a horrific event. My thoughts and prayers are with those effected. #prayforboston

Common: Prayers up for the people in Boston!

Bridget Kelly: Thoughts and prayers to all those in Boston who were caught in or knew folks hurt by the explosions

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

Karmin: Prayers with the people of Boston and all the families contributing to the Boston Marathon- cant believe this could happen. We went to see the finish every year during the 7 years we lived there.

2 Chainz: Yooo prayers go out to Boston ,,,, explosion at a marathon is the last thing u think is gonna happen

Jay Sean: Man just seein this bombing in Boston. Hope my people out there are ok. So horrible. Sick minded people out there man. Crazy.

Machine Gun Kelly: Bombs in trash cans now…we’ve truly lost control of ourselves. Why the fuck would you take the lives of innocent people?

Keri Hilson: God be with Boston.

French Montana: My prayers go out to the victims in the Boston explosion! #PrayforBoston

Chris Brown: Praying for Boston.

Pitbull: My heart goes out 2 those lost in #boston we must enjoy every minute & appreciate every one bcuz we never know que dios los bendiga

Jordin Sparks: I don’t even know what to say. My heart just hurts for those involved in what happened in Boston. Praying for everyone…

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!

Kelly Rowland: #PrayersForBoston

Azealia Banks: My heart and prayers go out to everyone in Boston right now. Life is so precious.

Bun B: Talked to my Boston people. They’re safe. But this shit is cold y’all. Lot of people hurt out there. #PrayForBoston

Shontelle: 2 explosions at Boston Marathon today. Don’t even have words. Shame on you the culprits. Innocent ppl. I don’t understand 🙁 #PrayForBoston

Miley Cyrus: Sending peace & many blessings to Boston ❤❤❤

Ashanti: Please Pray For Boston. #BostonMarathon #PrayForBoston My heart goes out to each & every victim.

Rihanna: Heartbreaking. #PRAY4BOSTON

Keyshia Cole: People are absolutely sick! I feel so bad this has happened! God Bless the innocent people hurt… God Bless

Marsha Ambrosius: Horrified!!! Praying for those affected by the tragedy in Boston!!!

Cassie: Too unreal, too sad #prayforboston

Brianna Perry: Lets come together as a nation and pray for everyone affected by today’s tragedy #PRAY4BOSTON

Mariah Carey: So sad I am at loss for words. My heart goes out to everyone in Boston. #PrayForBoston

Travis Barker: My prayers/love 2 everyone in Boston.Hope we catch the fucking coward that did this.Those poor kids & innocent people…damn #Pray4Boston

A$AP Rocky: MY HEART GOES OUT TO BOSTON AND EVERYONE WHO IS EFFECTED BY THIS BOSTON BOMBING

Kid Cudi: I really hope they find whos responsible for the bombings in Boston. My heart goes out to the victims and their families.

Nicole Scherzinger: My prayers and thoughts are with those who have loved ones in Boston. God bless you #PrayforBoston