Many other area venues are also adding protection

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The Boston Marathon bombings that shocked the world also shook communities that host entertainment venues, seeing firsthand as they did how easy it was to bring explosives into a crowd – and set them off.

Since the April 15 attack, the National Football League has banned a number of carry-in items from all its arenas, including Gillette Stadium in Foxborough, offering up a new, strict policy that allows fans to bring belongings in small, clear plastic bags only. Managers of other performance and sports venues south of Boston are also taking a hard look at their policies, with some intent on making changes to improve security, and others saying their restrictions are already stringent.

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