It appears that more than one person was involved in the Manchester massacre.

A 23-year-old man has been arrested Tuesday morning in connection to a probable suicide bombing at an Ariana Grande concert that left 22 people killed and dozens more injured in Manchester, England, according to The Washington Times.

Chief Constable Ian Hopkins of Greater Manchester Police Department said early Tuesday that 22 people are confirmed dead, with around 59 other casualties.

“We are currently treating this as a terrorist incident until we have further information,” Chief Constable Hopkins said.

The head of Manchester’s police said local police were working with counter-terrorism officials and solicited tips to an anti-terror hotline.

Citing U.S. and foreign intelligence sources, CNN reported that “the likely cause of the explosion was a suicide bomber,” and “a male has been identified” by British authorities as the attacker. NBC News reported similarly.

Prime Minister Theresa May said police believe they know the identity of the attacker who died, but they are not disclosing it immediately, The Associated Press reported.

Hours after the attack, police arrested a 23-year-old man in South Manchester in connection to the attack.

Britain had an election set for June 8, but the major parties said they would suspend their campaigns for the moment as the nation went into mourning.

Prime Minister Theresa May, a Conservative, said “all our thoughts are with the victims and the families of those who have been affected.”

Ms. Grande’s music is pitched to younger audiences and numerous eyewitness accounts said many of the casualties were children and teenagers, along with parents arriving to pick them up as the concert concluded.

Witness Gary Walker, from Leeds, England, told Britain’s Daily Mail that he was with his wife in the foyer of the arena waiting to pick up his two daughters who attended the concern.

“We heard the last song, and quite a few people were flooding out and then suddenly there was a massive flash and then a bang, smoke,” Mr. Walker said. “I felt a bit of pain in my foot and my leg. My wife said, ‘I need to lie down.’ I lay her down, she’d got a stomach wound and possibly a broken leg. I was about three meters from the actual explosion. I am surprised I got away so lightly”

Tim Farron, leader of Britain’s Liberal Democratic Party, called the blast “a shocking and horrific attack targeting children and young people who were simply enjoying a concert,” said

Besides calling it a “direct attack on children,” Nigel Farage, a former leader of the U.K. Independence Party and a frequent critic of immigration and the threat of Islamist terrorism, also predicted that the national debate around those subjects would change.

“This is going to be a very big shock for the country when it wakes up tomorrow morning,” he said on Fox News.

Manchester Arena, which was hosting the concert, issued a statement saying the explosion occurred on the street outside the venue.

“We can confirm there was an incident as people were leaving the Ariana Grande show last night,” read the statement. “The incident took place outside the venue in a public space.”

Some previous reports indicated that the blast occurred in the foyer of the arena near the box office, though people there would have been injured or killed as they left the concert and would have been affected by the resulting panic.

Concertgoer Abby Mullen from Airdrie, Scotland, told the Daily Mail that “as we were leaving, a bomb or explosion went off centimeters in front of me. People’s skin and faeces were everywhere including in my hair and on my bag.”

“That sound, the blood and those who were running around clueless with body parts and bits of skin missing will not be leaving my mind anytime soon or the minds of those involved,” she said.

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