A woman accused of assaulting a Metropolitan Transportation Authority employee in the Bronx is at large, police say.

According to authorities, the 53-year-old MTA cleaner was working on the 1 train at 242nd Street station when the woman sprayed her in the face with an unknown substance. The suspect fled wearing a dark-colored hoodie with a black mask and black pants.

Anyone with information about the incident is asked to contact Crime Stoppers at 1-800-577-TIPS.