No injuries were reported in the blast in Seaside Park, said Al Della Fave, spokesman for the Ocean County Prosecutor's office. He said no surrounding structures were damaged.
The FBI has taken over as the lead agency in the investigation. But officials would not say whether they believe the incident was terror-related or if they suspected participants in the third annual Semper Five run were targeted.
Brad Cohen, the acting special agent in charge of the FBI's office in Newark, declined to discuss the matter at length during a brief news conference staged Saturday evening. He also declined to take questions from reporters, citing the "active, ongoing" investigation.
The race was canceled, and the immediate area was put on lockdown. Several homes near the scene were evacuated as a precaution, though those residents were allowed to return home early Saturday night.
However, authorities said several beaches in the area would remain closed until further notice.
Authorities immediately cleared the boardwalk and beach area, and bomb-sniffing dogs were used to search the area.
Shortly after the blast occurred, Della Fave told reporters at the scene that preliminary reports said there may have been other devices connected to the pipe bomb, but those devices apparently had not gone off.
New Jersey State Police said later in the day that bomb technicians "rendered safe" items located in a plastic trash can where the explosion occurred; they did not specify what those items were or provide further details, citing the ongoing investigation.
Chad Ruedin, who happened to be walking along the boardwalk when the blast occurred, told News12 New Jersey that when he heard the explosion, he initially thought it was the start of the charity race. But after thinking about it for a minute, Ruedin said he thought to himself "that was one hell of a start to a race.
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