A bomb squad detonated a fireworks ball found in the Fort Hancock section of Sandy Hook this afternoon, authorities said.
Initially thought to be unexploded ordnance, the device was found near the SeaStreak ferry dock late morning, promoting authorities to suspend ferry service to the park, said Daphne Yun, a Gateway National Park spokeswoman.
The New Jersey State Police Bomb Squad detonated the device at about 4 p.m., Yun said, adding that ferry service normally ends at 4 p.m. but will resume normal operations tomorrow.
Hartshorne Drive was closed earlier but has since reopened, Yun said.
Yun did not provide any additional details about the incident.
In late June 2013, ordnance was spotted off Bay Head and detonated by a military explosives team.