An explosion at an Ariana Grande concert in Manchester, England, on May 22 left at least 22 people dead and around 59 others injured, according to police. (The Washington Post)

Several hours after an explosion characterized as a “terrorist incident” killed 22 people after her concert tour stop at Manchester Arena in England, pop star Ariana Grande said she is “broken” in the wake of the horrific tragedy.

“from the bottom of my heart, i am so so sorry,” the 23-year-old singer tweeted late Monday night. “i don’t have words.”

About 50 other concertgoers were injured in the attack, according to Manchester police. U.S. security officials told The Washington Post that evidence suggested a suicide bombing. The explosion occurred outside the venue, just as Grande finished the show and people started to leave the arena.

After a suicide bombing left 22 people dead at her show in Manchester, Ariana Grande has decided to suspend her concert tour. The pop singer's representatives released a statement confirming the cancellation of two shows that were scheduled at London's O2 this week as part of her "Dangerous Woman" tour. The statement read: "We ask at this time that we all continue to support the city of Manchester and all those families affected by this cowardice and senseless act of violence. Our way of life has once again been threatened but we will overcome this together." In addition to the London shows, the singers Switzerland concerts scheduled through June 05 have also been canceled. (Reuters)

Grande’s manager, Scooter Braun, also released a statement on Twitter: “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. We are thankful for the selfless service tonight of Manchester’s first responders who rushed toward danger to help save lives. We ask all of you to hold the victims, their families, and all those affected in your hearts and prayers.”

Grande has a fiercely loyal following of young fans ever since her days on Nickelodeon comedies “Victorious” and “Sam & Cat.” Over the last few years, she’s become one of the most famous pop stars in the world and a four-time Grammy nominee.

Late Monday, TMZ reported that Grande has suspended the rest of her “Dangerous Woman” tour, which was next scheduled for a stop in London on Thursday.

Rapper BIA, Grande’s opening act on her tour, also tweeted after the show:

Throughout Monday night, tributes and condolences poured in from stars across the world: