SANDY HOOK - An explosive device that turned out to be an unexploded fireworks ball was found at Sandy Hook Wednesday, causing the cancellation of midday ferry service from Manhattan.

Emergency personnel were called to the bay side of Sandy Hook near the Coast Guard station at around 11:30 a.m. when the explosive was found lying on the sandy area just north of the Sea Streak ferry ramp.

The area was closed and evacuated as a precaution, and the Coast Guard secured the Raritan Bay to boat traffic.

Pete McCarthy, of the National Park Service, says a commuter may have left it there or it could have just washed ashore from a boat.

Explosive experts from Earle Naval Base assisted park police by detonating the fireworks ball on site.

Several ordnances have been found along the Jersey Shore since Sandy struck last fall. In June, Navy divers had to detonate a World War II mine found underwater near Bay Head.