On September 17, 2016, the Seaside Semper Five 5K in Seaside Park, New Jersey, was expected to attract as many as 3,000 participants, including large numbers of military veterans. Shortly before the race was due to begin, organizers and police noticed a suspicious backpack near the starting area. At approximately 9:30 a.m., a pipe bomb hidden in a trash can on Ocean Avenue exploded. Investigators later found two additional rudimentary pipe bombs nearby and concluded that all three had reportedly been timed to detonate during the race, when the crowd would have been concentrated along the course. The blast scattered fragments into the street and shook nearby buildings, but the early discovery and evacuation meant that nobody was physically injured. The race was canceled, and the beach and boardwalk were cleared while police and federal agents conducted a door-to-door search for evidence. The bombing was eventually linked to a wider September 2016 terrorist campaign carried out by Ahmad Khan Rahimi, whose devices also included the pressure-cooker bomb that injured 31 people in Manhattan. Rahimi was captured after a September 19 shootout with police, convicted in federal court in 2017, and sentenced to life without parole in 2018. The Seaside Park incident remains a particularly chilling example of a sporting event being selected as a potential mass-casualty target, even though the plot failed to produce deaths or race-day injuries.
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