Ariana Grande Manchester attack: Katy Perry, Taylor Swift and more stars react

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Ariana Grande concert attack: Stars respond

Fox411: Katy Perry, Taylor Swift, James Corden and more react to the Manchester attack

Celebrities took to social media to respond to the explosion at an Ariana Grande concert in Manchester on Monday that left 22 people dead and dozens of others injured.

Multiple law enforcement agencies joined the UK police to investigate the incident, who are treating it as a "terrorist incident."

ARIANA GRANDE CONCERT EXPLOSION

Grande tweeted a short message to her fans after the tragedy saying her heart was "broken" and she was "so, so sorry."

Her rep confirmed earlier the star was "okay," adding that "we are further investigating what happened."

Her fellow celebrities shared their thoughts and concerns as the news unfolded.