Last Updated May 22, 2017 11:00 PM EDT
Joseph Carozza, a representative from Ariana Grande's U.S. record label, said the singer is OK following reports of an explosion at her concert in Manchester, England.
Late tonight, Grande shared a message on Twitter writing: "broken. from the bottom of my heart, i am so sorry. i don't have words."
following reports of a blast Monday night at Manchester Arena.
Greater Manchester Police Chief Constable Ian Hopkins said children are among the deceased.
It is being treated as a terrorist incident until police know otherwise, Greater Manchester Police said late Monday.
Sky News reported that the concert was sold out Monday.
The Dangerous Woman Tour is the third concert tour by Grande to support her third studio album, Dangerous Woman. The tour began on February 3, 2017, in Phoenix, Arizona, at the Talking Stick Resort Arena.
Musicians and celebrities posted messages of support as reports unfolded about the incident.
"My heart breaks for everyone who endured the terrifying attack at Ariana Grande's show in Manchester," wrote Paula Abdul.
"Praying for everyone at @ArianaGrande's show," Katy Perry posted.