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HARLEM, Manhattan — The Harlem subway fire that left an MTA worker dead and caused injuries to several others last month has been deemed a homicide, police said Thursday.

The MTA announced a reward of up to $50,000 will be offered for information that leads to an arrest. Crime Stoppers is also offering a $2,500 reward.

It happened on March 27 around 3:15 a.m. As a northbound No. 2 train pulled into the 110th Street/Lenox Avenue station, an MTA employee riding the train alerted the conductor to heavy smoke and fire coming from the second car, according to the MTA and police.

When firefighters extinguished the blaze, officers found three men and one woman suffering from smoke inhalation. They were taken to the hospital in stable condition, police said.

After the fire, Garrett Goble, the 36-year-old operator who had helped get people to safety, was found on the tracks and pronounced dead at the scene, according to FDNY.

No arrests have been made.

Submit tips to police by calling Crime Stoppers at 1-800-577-TIPS (8477), visiting www.nypdcrimestoppers.com, downloading the NYPD Crime Stoppers mobile app, or texting 274637 (CRIMES) then entering TIP577. Spanish-speaking callers are asked to dial 1-888-57-PISTA (74782).

Correction: This story has been updated with the victim’s correct occupation within the MTA.