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Article snippet: LONDON — Britain’s domestic intelligence agency, MI5, is investigating its response to warnings from the public about the threat posed by Salman Abedi, the suicide bomber who killed 22 people and wounded dozens more in an attack at a crowded pop concert in Manchester, England, last week. A British government spokesman said Monday that the agency had opened two internal investigations last week, amid reports that the British authorities had been alerted to Mr. Abedi’s extremist views at least three times before the bombing. Mr. Abedi, a 22-year-old Manchester resident of Libyan descent, had previously been flagged by MI5 as a “person of interest,” a law enforcement official said, speaking on the condition of anonymity because the investigations are continuing. But Mr. Abedi had not been deemed dangerous, so his file was closed and his name was taken off a list of roughly 3,000 people under active investigation. When a file is closed, all security alerts are removed. As a result, no warnings would have come up when Mr. Abedi showed his passport at border controls, the official said. Several people who knew Mr. Abedi, including some of his friends, have said they had warned the authorities about his radical views over the past five years. Mr. Abedi was barred from Didsbury Mosque, where his family worshiped, after he shouted at an imam who had condemned the ideology of the Islamic State militant group in a sermon, according to Akram Ramadan, a member of the Libyan c... Link to the full article to read more