Police say the incident happened at the Flushing Avenue subway station on the platform of the J/Z train line around 3:20 p.m.
The four victims got into a physical fight with an unknown group of male teenagers.
The fight resulted in a 16-year-old male stabbed in the left arm, a second 16-year-old stabbed once in the right side of the chest, a third 16-year-old stabbed once in the left side of the chest and a 21-year-old stabbed in the left arm and the left side of the chest.
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The victims all walked to Woodhull Hospital, which was nearby. All the victims are in stable condition.
It's unknown what caused the fight.
No descriptions were released of the suspects.
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So far, no arrests have been made and the investigation is ongoing.
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