NYPD Hopes New Evidence Will Help Solve 2016 Central Park Explosion

NEW YORK (CBSNewYork) – The NYPD hopes a new clue will help crack the case of a 2016 explosion in Central Park.

Connor Golden, an 18-year-old tourist from Virginia, jumped off a rock formation and stepped on a plastic bag that exploded. Part of his leg had to be amputated.

Investigators said the device contained traces of common substances that can be found at local hardware stores and seemed to be the work of a hobbyist.

On Tuesday, police released a photo of a bag they believe was tied to the case. The writing on the bag says "La Unica, Tropical Crackers."

"It was given out to customers and used to package crackers out of a bakery. It's been out of circulation for some time so it's unique to the store and geographic area, so hopefully it will generate some leads," ATF Agent Ashan Benedic said.

Golden's family hopes the new lead will result in an arrest soon. "We have not had closure. These people are still at large and a threat to the public so we just want to get to the truth of the matter," Connor's father, Kevin Golden said.

More: Teen Who Lost Part Of His Leg In Central Park Explosion Walking Again

Although the boy's mother says she believes the explosion was an act of terrorism, investigators continued to push back on that assumption. "It doesn't have the markers of terrorist activity... No online chatter, which are some of the indicators that indicate terrorism," Agent Benedic added. "We're investigating this as a criminal use of explosives."

The NYPD and ATF have offered a $40,000 reward for information leading to an arrest and conviction.

Anyone with information about the case is asked to call the Crime Stoppers hotline at 1-800-577-TIPS (1-800-577-8477) or ATF at 1-888-ATF-TIPS (1-888-283-8477), email ATFTIPS@atf.gov, or through www.atf.gov/contact/atf-tips or www.reportit.com.