The NYPD is on the lookout for a man who threatened a straphanger on the E train with a knife last month.

He was pushing a baby stroller at the time.

Investigators say the man had hit his child, prompting another rider to confront him about it.

The two started arguing as the train pulled into the West 4th Street Station.

The man can be seen pulling out a knife and spitting as he leaves with the stroller on the platform.

It happened back on June 24.

If you recognize the man, you're asked to call the Crime Stoppers Hotline at 1-800-577-8477.