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A man has died after being stabbed aboard a Metro Gold Line train in Irwindale late Tuesday morning, and a possible suspect has been detained in connection with the killing, authorities said.

Around 11:30 a.m., police received a call regarding a possible stabbing at the Gold Line station in Irwindale or on board a Metro train, said Ramon Montenegro, a spokesman for the Los Angeles County Sheriff’s Department’s Transit Services Bureau.

Duarte city officials later confirmed the stabbing took place on the train.

After, the train continued westbound to the next Gold Line station in Duarte, where law enforcement personnel from multiple agencies as well as L.A. County Fire Department paramedics responded, according to Montenegro.

The victim was pronounced dead at the scene. He has not yet been identified.

A man described as a possible suspect has been detained by deputies, Montenegro said.

Sheriff’s officials said a weapon was recovered at the scene, but declined to provide further details on what type of weapon it was.

Metro trains skipped the Duarte stop for most of the day, with buses shuttling riders past the station in the 1600 block of East Duarte Road until it reopened late Tuesday night.

Metro officials said a deadly incident like Tuesday’s hasn’t occurred on their trains in at least three years.

“The L.A. Metro is safe,” Brian Haas, an agency spokesperson, told reporters. “We move about 1.3 million people every single day, and this is a shocking tragedy. It’s shocking because it’s so uncommon.”

No motive was immediately known, but detectives are now reviewing surveillance video from inside the train to determine what led up to the fatal confrontation.

The Irwindale Police Department and the Temple Sheriff’s Station are also investigating the deadly stabbing.

Anyone with information is asked to call the L.A. County sheriff’s Homicide Bureau at  323-890-5500, or leave an anonymous through Crime Stoppers by dialing 800-222-8477.

KTLA’s Steve Bien and Erika Martin contributed to this report.