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A 57-year-old man was killed Monday evening at a Brooklyn subway station after the doors of an A train closed on his bag and the train pulled away with him still attached.

Getting into it: Yaw Boahene was stepping off the train at the Utica Avenue station in Bedford-Stuyvesant just before 6 p.m. when the doors shut on the thin blue plastic shopping bag in his hand, police said. Sources told the New York Post that Boahene, who walked with a cane, banged on the doors as the train started to move, and that the bag may have been too thin for the door sensors to pick up. He was dragged along the platform, hit a wall at the end of it and fell onto the tracks. Police found him unconscious and he was pronounced dead at the scene.

The MTA has pulled the train’s conductor and motorman from duty while it investigates, but hasn’t said what went wrong or whether any safety system could have stopped it. Conductors sit in the middle of the train and are supposed to check both directions before it leaves, and they can reopen the doors or hit an emergency stop if someone is caught, according to transportation accident attorney Andrew Maloney.

Unlike elevator doors, he said, subway doors don’t automatically spring back open when they close on someone. One rider on the train told ABC 7 New York she didn’t think the conductor “noticed at all at first,” and that she ended up calling 911 herself because there was nobody from the MTA at the station.

Boahene’s death comes nearly four years after a 20-year-old man died at Columbus Circle when a 1 train’s doors closed on his bag or clothes and dragged him onto the tracks.