The assault, which was captured on video and has been shared numerous times on social media, happened at Central Pizza on Saturday night, around 9:45 p.m.
According to police, the woman physically assaulted a customer who was at the restaurant.
Police are looking for information from the public that might help them identify the woman.
Anyone with information is asked to contact Berlin police at 860-828-7080. Information can also be submitted anonymously via their tip line.
The owner of Central Pizza said this all happened right before closing time, and said he couldn’t believe what he was watching.