Read this 17-year-old's firsthand account of the attack in Manchester

Student Joe Ryan recounts what happened Monday night at the Ariana Grande concert.

Thousands of excited fans were at Manchester Arena for Monday's Ariana Grande show when an explosion went off near an exit. Officials say 22 people were killed, with dozens more injured.

A 17-year-old in attendance gave a firsthand account of the chaos in a story for the Washington Post. Student Joe Ryan recounted excitement of seeing Grande live, followed by the overwhelming dread and confusion that followed.

"It came from outside near the main foyer, I think," he said of the explosion. Panic and fear set in and he ran, trying to keep tabs on his friend.

Authorities described the incident as a suicide attack, and on Tuesday identified the suspect as 22-year-old Salman Abedi, a student at a U.K. university, the BBC reports. He was reportedly born in Manchester. A 23-year-old was also arrested in connection with the investigation. The Islamic State claimed responsibility, but officials haven't verified their connection.

"What happened makes me sad, because concerts are supposed to be safe and a celebration of music," Ryan wrote for the Post. "More than four hours later, I am still unable to sleep. ... I am shocked and at a loss for words. My heart goes out to the victims and their families — nobody deserved to experience the events of this night."

Read Ryan's full story, including his comments on security, here.

The fear continued into Tuesday, with Britain's Prime Minister Teresa May increasing the threat level in the country to critical, the highest designation possible, The Guardian reports. In doing so, she said a "further attack may be imminent."

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