LONDON — An explosion struck an Ariana Grande concert in northern England late Monday, killing at least 22 people and injuring dozens in what police say they are treating as a terrorist attack. Greater Manchester Police revised the death toll from 19 to 22 early Tuesday morning. The force’s chief constable, Ian Hopkins, said Tuesday they believe one person carried out the attack. Police are trying to determine if the person acted alone or had support in the Monday night blast. Police say some 400 officers were deployed overnight to help with the investigation. Emergency vehicles were helping the injured and bomb disposal units were later seen outside the venue. https://www.youtube.com/watch?v=h6qQCh2fwjI

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