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Article snippet: With bomb-sniffing dogs, bag inspections and rows of metal detectors at the entrance, the modern concert arena is in some ways a fortress. But the blast that killed 22 people on Monday at an Ariana Grande concert in Manchester, England, highlighted the dangers that still exist along the perimeters of these buildings — on the street or in public concourses where concertgoers and others may gather in large numbers, unexamined by any security force. Investigators say the explosion at Manchester Arena occurred in a foyer just outside the venue’s doors, a space that connects the arena to the nearby Victoria rail station. SMG, the company that manages the arena, said that it is not responsible for policing that space. The episode immediately recalled the Event Safety Alliance, a trade group, believes that comparison is not quite apt. “It’s less like the Bataclan than it is the Boston Marathon bombing, which also took place on a public street, surrounded by law enforcement,” Mr. Adelman said. “It was another target-rich environment for someone with bad intent.” With the Manchester bombing, the multibillion-dollar music touring industry is once again confronting the specter of violence. Last summer, with the Paris attacks still a fresh memory, the singer Christina Grimmie was shot while signing autographs in Orlando, Fla., and in a separate episode in the same city a gunman killed 49 people at the Pulse nightclub. Ms. Grande’s tour is scheduled to stop at the O2 arena in... Link to the full article to read more