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Manchester Arena attack: What happened at the Ariana Grande concert

MANCHESTER, England — An explosion ripped through a crowd of people leaving an Ariana Grande concert in Manchester, England on Monday night. The deadliest attack on British soil since the 2005 London bombings has left a country in mourning and police searching for answers.

Here’s what we know — and don’t know — so far.

What we know

• At least 22 people, including children, were killed in the blast, which rocked Manchester Arena at around 10:35 p.m. local time (5:30 p.m. ET) as fans were leaving the venue.

• At least 59 people were injured. Police said that victims were being taken to eight area hospitals for treatment.

• British Prime Minister Theresa May, who chaired an emergency Cabinet meeting Tuesday, said authorities believe they know the identity of the attacker.

• Police said they believe the attack was carried out by a lone male attacker, who died in the powerful blast.

• ISIS claimed responsibility for the attack, but offered no evidence to support the claim.

• Police have arrested a 23-year-old man in connection with the attack.

• An improvised explosive device is believed to have been used in the attack, police said.

• Arena representatives said that the explosion occurred outside the main concert area, in a “public space.”

• The arena, built in 1995, has a capacity of about 21,000 people. It is not clear how many concertgoers were inside the venue on Monday evening.

What we don’t know

• The identity of the attacker: May said authorities believe they know who he is, but that his name name can’t be released at this point in the investigation.

• The motive: While police say they believe the attacker was working alone, police said they were investigating whether the attacker was part of a larger network or plot. Although ISIS claimed the bombing, the terror group did not mention a name and did not post a photo or provide any additional details.