Pop star Ariana Grande said she was “broken” five hours after a bomb attack killed 22 people and wounded over 50 others at her concert in Manchester, England.

No fewer than 22 people, including some children, were killed and 59 wounded when a suicide bomber struck as thousands of fans streamed out of a concert by the US singer Grande in the English city of Manchester on Monday.

Making her first comment since an explosion detonated just outside Manchester Arena at the end of her performance there, Grande said on Twitter,

“broken. from the bottom of my heart, I am so so sorry. I don’t have words.”

broken.
from the bottom of my heart, i am so so sorry. i don’t have words.

— Ariana Grande (@ArianaGrande) May 23, 2017

Representatives for Grande have said that the 23-year-old pop star was physically “okay” following the blast, which British authorities say was being treated as a terrorist attack.

Two US officials on condition of anonymity said that initial signs pointed to a suicide bomber as being responsible for the attack.

Grande was performing in Manchester during the European leg of a concert tour to support her latest album, “Dangerous Woman.