Police are looking for two teens who they say punched a subway conductor in the head last month in Brooklyn.

Investigators say the conductor had stuck her head out the window of an L train at the Livonia Avenue station on February 25 to do a safety check.

That's when they say the teenager punched the conductor in the back of the head.

The train was stopped so she could find her attacker.

While the train waited, police say the teen hit the conductor a second time. 

The conductor was treated for minor injuries at the hospital.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.