NEW YORK (CBSNewYork) — A firework that exploded when a 18-year-old unwittingly stepped on it Sunday in Central Park, seriously injuring his left foot, didn’t appear to be designed to intentionally hurt people, police officials said.

WCBS 880’s Sophia Hall reported the victim, identified at Connor Golden, suffered a severe leg injury. The explosion happened just before 11 a.m. near 60th Street and 5th Avenue.

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WCBS 880 reported that Golden was with a group of three young men from the Washington, D.C. area.

“I don’t know what happened. I don’t know what happened,” one of the men told WCBS 880.

An eyewitness told CBS2 that Golden was climbing a rock structure and stepped on something that “exploded.”

Police officials believe a homemade firework likely caused the blast, CBS2’s Hazel Sanchez reported. The commanding officer of the New York Police Department’s bomb squad said Sunday there’s no indication it was made to harm people.

Mark Torre likened the explosive to an experiment that an enthusiast with a rudimentary understanding of chemistry could build from household materials.

Investigators don’t believe the injured 18-year-old or his friends took part in constructing the explosive. They’re asking anyone with information to come forward.

Officials say Golden is undergoing surgery on his left foot at a hospital. He’s in stable condition.

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A bomb-sniffing dog went into the rock area where the explosion took place.

Scene of the Central Park explosion. (credit: 1010 WINS/Roger Stern)

Scene of the Central Park explosion. (credit: 1010 WINS/Roger Stern)

CBS2 video captured the sound of the explosion while guests were filing into Elie Wiesel’s funeral in the Upper East Side.

Mayor Bill de Blasio tweeted: “Dangerous incident in Central Park today. Fireworks are fun – but let’s leave them to the professionals. Stay safe.”