On the heels of the 15th anniversary of the September 11 attacks, last night’s yet-to-be-explained Chelsea bombings, which saw 29 people injured after an intentional explosive device was placed in or near a dumpster, understandably has many shaken up.

NEW YORK, NY - SEPTEMBER 18: A mangled dumpster sits on the sidewalk at the site of an explosion that occurred on Saturday night on September 18, 2016 in the Chelsea neighborhood of New York City. An explosion in a construction dumpster that injured 29 people is being labeled an "intentional act". A second device, a pressure cooker, was found four blocks away that an early investigation found was likely also a bomb. (Photo by Justin Lane-Pool/Getty Images)

Celebrities were no exception, taking to Twitter to react to the shocking event. Find out what they had to say below.

1. Lady Gaga: Mother Monster left her friends and fans with this message of warmth.

2. Laverne Cox: NYC enthusiast Laverne Cox sent thoughts and love to the Big Apple.

3. Nicole “Snooki” LaValle: Nicole was serious and reflective in her reaction, a change from her usual goofball ways.

4. Mara Wilson: After telling Chelsea residents to “please be safe,” Mara attempted to infuse some humor into the situation.

5. Leah Remini: Leah kept things short and simple with a retweet of the news and two single words.

6. Questlove: Questlove got the news late due to a performance, but made sure to check in on all his NYC peeps afterwards.

Did you witness the explosions? Share your story with us @BritandCo.

(h/t ET, photos via Matt Winkelmeyer/Getty)