The NYPD is on the lookout for a suspect they say viciously attacked a woman after an altercation on the northbound 7 train.

Cops said that on Dec. 21, around 9:15 a.m., a 37-year-old woman was boarding the subway at Queensboro Plaza when she "accidentally bumped into another female while taking a seat. The female suspect sitting next to the victim began a verbal argument with her."

At that point, authorities alleged the suspect "began to pull the victim's hair and continuously punch her in the face, head, shoulder and back."

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The victim reportedly suffered a dislocated right shoulder after the melee. 

Cops said that the suspect got off the subway at either Vernon Boulevard/Jackson Avenue station or Hunter Point station.

The suspect is described as an Asian female, approximately 35-years-old, 5-foot-4 and 120 pounds with brown eyes and long wavy red hair. Authorities added that the suspect was last seen wearing a black waist-length coat and multi-colored scarf.

Anyone with information about the incident is encouraged to contact the NYPD's Crime Stoppers hotline at 1-800-577-TIPS. Tipsters can text information via 274637 (CRIMES) and then entering TIP577, too. 

The public can also submit tips online at www.nypdcrimestoppers.com.