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The BAA said runners will be allowed to wear small fanny packs to carry food, medicine, identification, cellphones or other necessary small items. They can also bring water bottles, but they must be one liter or smaller. Organizers are discouraging runners from wearing headphones, but they will be permitted.

Kurt Schwartz, the state’s undersecretary for public safety, said officials are trying to maintain the excitement of marathon while at the same time ensuring the safety of the thousands of marathon participants and spectators.

“It will still feel like a great day and it will be a great day,” said Schwartz, who noted that rules for race spectators have not be finalized.

“We are going to strike a good balance between public safety and security, and ensuring that this is a celebratory and festive event like it has always been.”