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NYPD Detectives Chief Robert Boyce, left, and ATF New York Field Division Special Agent in Charge Ashan Benedict speak to reporters during a news conference near the scene of an unsolved 2016 explosion in New York's Central Park, Wednesday, June 28, 2017. The New York Police Department and federal officials are offering up to $40,000 in reward money for information that leads to an arrest in the explosion last summer in Central Park that injured a tourist.  (AP Photo/Mary Altaffer)
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Reward up to $40,000 for leads in Central Park blast mystery

NYPD Detectives Chief Robert Boyce, left, and ATF New York Field Division Special Agent in Charge Ashan Benedict speak to reporters during a news conference near the scene of an unsolved 2016 explosion in New York's Central Park, Wednesday, June 28, 2017. The New York Police Department and federal officials are offering up to $40,000 in reward money for information that leads to an arrest in the explosion last summer in Central Park that injured a tourist. (AP Photo/Mary Altaffer)

NEW YORK (AP) — New York police and federal officials are offering up to $40,000 in reward money for information that leads to an arrest in a Central Park explosion that injured a tourist last summer.

Officials said Wednesday they’re still looking for leads, including photos and video in the hours and days before the July 3, 2016, explosion.

A homemade concoction inside a clear plastic bag blew up when a tourist from Virginia stepped on it.

Tourist Connor Golden lost his left foot in the blast. Doctors amputated his leg below the knee.

The New York Police Department and federal agents have tracked the origins of the bag, identified the chemicals in it and reviewed thousands of hours of footage. But the case remains unsolved.

The park gets about 250,000 visitors a day.

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