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Four hours after an explosion rocked Manchester Arena in England at the end of a performance by the pop star Ariana Grande, here is what is known.
What We Know
• At least 19 people were killed and some 59 people wounded in an explosion around 10:35 p.m. on Monday in the foyer outside the main hall of the arena.
• The police said they were treating the case “as a terrorist incident.” The authorities believe the blast came from either an abandoned backpack or a suicide bomber, a senior American intelligence official said. British officials said they were investigating reports that the explosive device contained nuts and bolts as shrapnel.
• The crowd was filled with teenagers and other young fans of Ms. Grande, a 23-year-old American singer. She was not hurt. Shortly before 4 a.m., she tweeted, “broken. from the bottom of my heart, i am so so sorry. i don’t have words.”
• People described a scene of pandemonium and mayhem after the explosion.
• The arena, built in 1995, can fit up to 21,000 people; it was not clear how many were inside on Monday evening.
• Manchester Victoria station, a rail terminal next to the arena, was evacuated.
• Rail service at the terminal, a major transportation hub in the city, was suspended late Monday night and will remain suspended all of Tuesday. At least one explosion occurred in a foyer of the Manchester Arena, which connects to the rail station, the police said.
• Manchester’s light rail service, Metrolink, was also suspended at the station.
• The explosion evoked memories of the November 2015 terrorist attacks in Paris, which targeted a concert hall and a soccer stadium, along with bars and restaurants.
• Terrorism remains a significant threat in Britain. On March 22, a 52-year-old British man rammed a car into a crowd of pedestrians on Westminster Bridge, outside Parliament, killing four of them. He then fatally stabbed a police officer guarding Parliament before he was fatally shot by the police. The Islamic State claimed responsibility for the attack.
• Britain has been on the second-highest terrorism alert level since August 2014. The level, “severe,” means that an attack is highly likely, and is only one level below the highest, “critical.” Britain raised it in 2014, citing increasing threats by the Islamic State. The threat level, which is set by the country’s security service, MI5, has stayed at “severe” ever since.
What We Don’t Know
• NBC News, citing American intelligence officials, reported that the explosion was the work of a suicide bomber, but that account could not be immediately confirmed.
• The type of device used in the attack.
• The identity of the attacker or attackers, and a motive. No individual or group has taken responsibility for the explosion.
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