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The Boston bombings on April 15 left more than 200 people injured and several people without limbs.
Frederick is ready to welcome 27,000 people expected to compete in the Tough Mudder endurance competition at Crumland Farm on Saturday and Sunday.
The Shootout for Soldiers, which will feature hundreds of players during the game, will be divided up into 1-hour sections. For a single game, it will be a record.