“Broken,” the 23-year-old singer wrote on Twitter. “From the bottom of my heart, I am so, so sorry. I don't have words.”
Police have confirmed 22 people were killed and more than 50 were injured, following a reported explosion at the conclusion of the singer’s Manchester Arena show. CBS News reported additional details of the attack.
“She’s an absolute wreck,” a source close to the star told ET. “She cares more about her fans than anything.”
Grande’s manager, Scooter Braun, also released a statement on social media following the incident.
“Tonight, our hearts are broken,” he wrote. “Words cannot express our sorrow for the victims and families harmed in this senseless attack. We mourn the lives of children and loved ones taken by this cowardly act.”
Braun went on to thank the emergency service workers who quickly came to the aid of affected concert-goers.
“We are thankful for the selfless service tonight of Manchester's first responders who rushed towards danger to help save lives,” he said. “We ask all of you to hold the victims, their families, and all those affected in your hearts and prayers.”
Concert promoter Live Nation have stated they are “deeply saddened by this senseless tragedy,” while iconic New York City venue Madison Square Garden announced they have increased security measures following the attack.