Ariana Grande Fans Are Trying To Figure Out Who's Responsible For Manchester Attack

Ariana Grande fans from around the world are trying to figure out who is responsible for the attack at the star's Manchester Arena concert that left at least 19 people killed and about 50 more injured.

UPDATE: Manchester police revealed Tuesday morning that at least 22 people are dead and about 60 injured after a lone bomber detonated an improvised explosive device outside an Ariana Grande concert in Manchester, England. The attacker is deceased and police believe he acted alone. According to CNN, authorities are investigating whether the attacker was part of a broader terror network.

Here's how you can help victims of the attack, which is the deadliest Britain has seen since the 2005 London bombing.

Grande was not injured at the concert and tweeted after the event: "broken. from the bottom of my heart, i am so so sorry. i don't have words."

EARLIER: According to NBC News, ISIS has claimed responsibility for the attack. However, it has not been confirmed and they "produced no evidence."

Greater Manchester police reports that officials were called to the venue after reports of an explosion just before 10:35 p.m. local time on Monday, May 22.

Elite Daily has reached out to Ariana Grande's reps for comment but did not hear back by the time of publication. Ariana Grande's rep told E! News, “Ariana is okay. We are further investigating what happened.”

Fans and people in the area immediately jumped in to help victims of the Manchester attack by retweeting photos of those missing on Twitter, offering food and shelter, and using Facebook's "mark yourself safe" feature.

With the tragic news, fans are taking to Twitter to express their sadness and frustration with the attack.

People want to know who is responsible for the attack.

NBC News reports UK authorities suspect the explosion at Grande's concert could have been a suicide bombing.

Manchester police say they are treating the event as a terrorist incident “until police know otherwise.”

Officials also tweeted that they were planning to conduct a controlled explosion in Cathedral Gardens, but it turned out not being a suspicious item.

Esme Findlay attended the concert and told People: 

Everyone was laughing and talking about the show before the sound … But then, everybody began screaming immediately and pushing to get out. It was very loud because of the screaming. No one knew what it was … but people were screaming 'bomb! bomb!' and there was a lot of panic.

Ivo Delgado also attended the Ariana Grande concert. He told NBC News that he "just heard a loud bang" right as the concert was ending.

Our thoughts and prayers are with all of those affected by this tragic incident in Manchester.