KAMI learned from Inquirer.net that Ariana Grande's concert in Manchester, England with 21,000 capacity turned into a tragedy for some.
The singer posted a heartfelt apology in her post in twitter.
22 people died and 50 were wounded in what the authorities described as "terrorist attack."
Though the 23 year old singer was reported safe, she sincerely feels sorry for what happened.
Britain is now on "severe" level of alert.