Police say 31-year-old Keith Magoon sexually assaulted a 17-year-old girl and two 16-year-old girls Wednesday night at the downtown Wichita YMCA. 

The mother of one of the victims talked to KAKE News by phone. 

Her daughter says she and two of her friends were visiting the Y with a local group home Wednesday night. The girls say they were swimming when Magoon, a complete stranger, began following them. 

"Eventually he was saying nasty things and grabbing ahold of them," says the mother.

Her daughter says at one point, Magoon was holding one of her friends by the waist, so she stepped in to try and help. 

"And at that point he pinned my daughter up against the side of the pool and said very nasty things to her and assaulted her...she was just frozen. She didn't know what to do," she says.

Her daughter says the lifeguard inside saw the girls in distress, but didn't do anything to help them. 

"Major frustration with the YMCA and with the staff there...They're responsible for the safety of the people that are there and they dropped the ball," she says.

This isn't the first time sexual assault accusations have been investigated at the downtown YMCA. Caleb Gaston was an employee when he attacked two toddlers in the Kid Zone in 2018. Just last month, he was sentenced to 27 years in prison.

The YMCA has since improved its security systems, but after the attack this week, some members worry for their safety.

"I'm really questioning what's going on here at this Y. That makes me feel uncomfortable going in there right now. Someone needs to look into what's going on. This should not be repeatedly happening," says member, Heather Gammill.

The victim's mother says her daughter is traumatized and  hopes no one else will ever have to go through what she has.

The YMCA declined our request for interview and refused to answer any questions. The center released the following statement: 

"The Greater Wichita YMCA is aware of and supporting the investigation of an incident involving guests at our Downtown YMCA. As with any active police investigation we are not able to discuss the case, its specifics, or provide additional information at this time.

We are heartbroken and are working closely with the police to determine what happened. The safety of our members and guests is our priority and over the last year the YMCA instituted numerous additional safety procedures. This case appears to involve a guest through a partner organization and we will continue examining those programs as well as our overall programs to ensure the safety of all our members and guests."

The YMCA does sex offender screenings all members, guests and employees, but Magoon is not a registered sex offender.