CLEVELAND, Ohio — A 19-year-old strip-club dancer and her sister were attacked by a group of other dancers and security guards in a fight that spilled out of a downtown club, according to police.

The incident happened about 2 a.m. Monday at Paradise Gentlemen’s Club on Frankfort Avenue between West 6th and 9th streets. No arrests have been made in the case.

The dancer was treated at the Cleveland Clinic for a swollen eye.

The dancer’s 23-year-old sister — who recently had surgery for bone-marrow cancer — was treated at the hospital for unspecified injuries, police reports say. She told police that she struggled walking after having the surgery, but was unable to walk at all after the beating.

The dancer told police that she asked club employees for her pay for the day when a fight broke out between a different dancer and a security guard, according to police reports. The dancer said she got caught in the middle of their fight and a security guard shoved her out of the club, police reports say.

A security guard attacked both the 19-year-old woman and the other dancer. The other dancer ran and locked herself in a car, police reports say.

A different dancer joined in the fight and attacked the 19-year-old dancer, according to police. She called her sister for help.

The woman’s sister told police that she saw a security guard punch her sister in the face, according to police reports. Her girlfriend recorded parts of the attack on her cellphone, police reports say.

The dancer’s sister tried to defend her, but another dancer grabbed her hair from behind and slammed her to the ground, police reports say. About 15 people took part in the attack, police reports say.

The 19-year-old dancer told police she managed to get to her car where she grabbed a slingshot and pointed it at the group.

A security guard, who had been watching the fight and goading everyone, told the dancer to stop. The security guard then made the dancer and her sister leave, police reports say.