As news spread of the tragedy at Sandy Hook Elementary School in Newton, Conn. where Ryan Lanza reportedly shot and killed 29 people, 20 of whom were children, many people took to social media to express their sentiments and condolences, including celebrities.

The shooting, where Lanza reportedly shot the school principle, then shot and killed his mother, 18 of her students and at least seven other adults, is said to be among the worst in recent history. The tragic incident occurred several days after another gunman shot and killed two people in a Portland, Or. shopping mall before killing himself.

Both incidents has led many celebrities to comment on the gun control laws in America. "Gun control is no longer debatable- it's not a 'conversation'- It's a moral mandate," veteran actress Mia Farrow tweeted.

Sarah Silverman weighed in as well. "Band-Aids-on-Band-Aids @NRA people want MORE access to guns to combat all the people w access to guns," tweeeted the comedian.

Here is a list of celebrities expressing their hearfelt condolences on Twitter: 

Adrienne Maloof: Terrible terrible news about the shooting in Connecticut. Sending thoughts and prayers to everyone involved.... 

Alyssa Milano: What the f*ck is wrong with people? 

Ashley Greene: Some things are just bigger than me and impossible for me to understand. My thoughts and prayers are with the families in Connecticut. Audra McDonald: No words. #prayfornewton 

Bethenny Frankel: MONSTER. Those poor helpless children & babies. I don't remember hearing something so evil 

Blake Shelton: The killing of defenseless people and innocent children. I'm sad and sickened. This is why we all should be prepared to defend and guard. 

Brandi Glanville: I can not believe this school shooting, what is wrong with people!!!! My heart is breakking for the kids and families. 

Christina Applegate: There are just no words. Only sorrow. We are all shedding tears today for those families. 

Courteney Cox: Praying for Sandy Hook 

DJ Pauly D: My Prayers Go Out To Everyone Affected By This Horrible Shooting In Connecticut 

Elisabeth Hasselbeck: Please #prayfornewtown. Praying with you. #whyGodwhy 

Giuliana Rancic: This tragedy is beyond heartbreaking. Imagine how excited these little kids were for the holidays. Why? Why? Why? Tragic and senseless. 

Hilary Duff: Oh my.I am shocked.Heartbroken.Devastating news about this elementary school 

Ian Somerhalder: We are sad.Our hearts,thoughts&help are w/you.Im so sorry to all affected by this.So sorry.May all thelove in the world hug you in this time

Jenny McCarthy: Cant stop crying. My heart goes out to these familes. 

Jesse Tyler Ferguson: I'm sick to my stomach about the tragedy at Sandy Hook Elementary. All my thoughts are with the community of Newtown, CT. J

Joan Rivers: Hearing the news of the sad tragedy in CT. I'm horrified and heartbroken - my thoughts and prayers are with the victims and their families. 

Joe Jonas: Please Pray for everyone in Newtown, Connecticut. 

John Stamos: soulless coward pulls trigger, children die, officials express regret and then what -we wait for the next shooting? how do we stop this?

Josh Duhamel: My heart hurts for the victims & their families of the CT school shooting. This needs to stop. Schools must be safe again. 

Joy Behar: My thoughts and prayers are with the families of Sandy Hook Elementary. 

Kate Walsh: Horrible. My thoughts and prayers go out to the children in newton and their families. 

Keri Hilson: It's time to re-evaluate those gun laws you spoke about, @BarackObama. Prayers for surviving children & families in Newtown, Connecticut. 

Khloe Kardashian: I am sick to my stomach. 18 children and 9 adults lives were stolen today. I'm so sorry for the sadness and pain this has caused. PRAY 

Kim Kardashian: In total shock over the school shooting in Ct! 18 children shot dead & 9 adults by a father of one of the kids! What has this world come to 

Kirstie Alley: No comprehension of such insanity, violence and evil... 

Kourtney Kardashian: If this tragedy doesn't change something in this country regarding guns...I just want to scream and cry. Deeply saddened. Praying 

Kristin Chenoweth: Well im hearing about this shooting in CT. Praying. Sending prayers. 

Lindsay Lohan: This is absolutely horrifying. Our thoughts and prayers go out to the families in Newton, CT. So unbelievably sad. 

Maria Menounos: Heartbreaking.As many as 20 children shot by gunman this morning at a CT elementary school. Multiple fatalities reported. #Connecticut #pray 

Miranda Lambert: I'm praying for those babies and all the victims of the Connecticut shooting. May God bring peace to the families. 

Piers Morgan: Don't just mourn these poor dead children America - get angry and do something to stop these senseless shootings happening.

Rihanna: God have mercy!!!! No one deserves this! Praying for the families of the victims of the Connecticut shooting!! What a Christmas it will be

Rita Ora: Wow this is horrific everybody in Connecticut the children my love and the bots love goes out to you #isthereanyhopeleft  

Sherri Shepherd: My heart is broken for the parents, family & faculty of #SandyHook Elementary School... can't stop praying & crying. Such a senseless act 

Steve Carell: Pray for Sandy Hook, Newtown CT. 

Vinny Guadagnino: Praying for the Victims in the Connecticut school shooting. This is happening too much.

Tags: Connecticut Shooting ryan lanzla celebrity tweets