Queens detectives are looking for the suspect behind a violent stabbing on the 7 train late Sunday night.

Police sources said the violent assault occurred on a Flushing-bound 7 train at the 111th Street station in Corona just before 11:40 p.m. on Sept. 21.

The motive for the assault remains unknown and under investigation, but police reports indicated the victim, a 25-year-old man, was able to depart the train at the 111th Street station after being attacked.

Officers from the 115th Precinct and NYPD Transit District 20, in responding to a report of an assault at Roosevelt Avenue and 111th Street — the intersection where the station is located — found the victim with stab wounds to his neck and back.

EMS rushed him to NewYork-Presbyterian Queens Hospital in Flushing, where he was liste

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