The man who opened fire on a packed subway train last year, sparking terror underground and leaving 10 commuters injured, pleaded guilty on Tuesday to the gruesome attack.

Frank James filed documents last month indicating his intention to cop to a superseding indictment hitting him with 10 counts of committing a terrorist attack or other violence against a mass transportation system over the April 12, 2022, mass shooting.

James allegedly traveled to Brooklyn from an Airbnb in Philadelphia and boarded the Manhattan-bound N train with a smoke bomb, gas mask and handgun, federal prosecutors charged.

As the train moved between the 59th Street and 36th Street stations, the smoke bomb in James’ bag went off, authorities said. James then donned the mask and opened fire.

No one was killed in the incident, but it left the platform at 36th Street a bloody mess strewn with bodies.

James fled and was only captured after a 30-hour manhunt that culminated with the shooter calling Crime Stoppers on himself, leading to his arrest.

A spokesman for the MTA praised prosecutors for bringing James to justice.

“The victims of this reprehensible attack deserved and received justice,” MTA communications director Tim Minton said. “As we recall the transit workers who assisted riders to safety that terrible day and security cameras that helped investigators rapidly catch the suspect, we hope this perpetrator will never again be free to hurt innocent people.”

Raymond Chiodini

John Minchillo/AP

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Additional reporting by Ben Feuerherd