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Suspect ID'd in Manchester attack that killed 22, injured 59

British authorities have identified the man accused in a bombing that killed 22 people and injured 59 others outside of a Ariana Grande concert in Manchester, England Monday.

The suspect, identified as Salman Abedi, died at the scene after using an improved explosive device, officials said, but police are still determining if Abedi was part of a wider group, said United Kingdom Prime Minister Theresa May.

What we're learning about the suicide bomber and the victims of the tragic attack, on Channel 2 Action News starting at 4 p.m.

On Tuesday, a 23-year-old man was arrested in South Manchester in connection with the deadly explosion.

Monday's incident is being treated as a terror attack and May said the threat level remains at "severe," meaning the government considers another terror attack highly likely. Severe is level 4 out of 5, with critical being the highest.

The Islamic State group claimed responsibility Tuesday morning, saying one of its members planted bombs in the middle of crowds.

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"We struggle to comprehend the warped and twisted mind that sees a room packed with young children not as a scene to cherish but as an opportunity for carnage," May said Tuesday.

President Donald Trump on Tuesday called out the "evil losers" who he said were behind the explosion that brought "death to innocent young people" who were attending a pop concert.

"So many young, beautiful, innocent people living and enjoying their lives murdered by evil losers in life,” President Trump said early Tuesday morning.

Trump tweeted his support to the victims Tuesday.

“We stand in absolute solidarity with the people of the United Kingdom,” he tweeted.

Greater Manchester Police said they were called to the Manchester Arena just before 10:35 p.m. local time on Monday. The explosion happened near the arena’s foyer after the concert finished, according to witnesses, who reported hearing a loud bang as they exited the arena.

The venue holds about 21,000 people and is one of Europe’s largest indoor arenas, according to its website. The concert arena is connected to the Manchester Victoria Station, the city’s second-largest train station.

ABC News contributed to this report.