Grandville, Mich. (WZZM) - Two teenage volleyball players say they were touched inappropriately and illegally by a coach during training at a facility in Grandville.

42 year-old Florencio Castillo is charged with one count of 3rd and one count of 4th degree criminal sexual conduct.

During one-on-one instruction at the Impact Dynamic Training center on 28th Street, a pair of 15 year olds say they were molested.

"Our first victim pulled a muscle and he was treating her for that particular injury, helping her stretch," explains D/Sgt. Renee Veldman.

The teenager told her parents she felt "violated" and they contacted police.

"Then a second individual did come forward and reported an inappropriate touching had occurred to her as well," says D/Sgt. Veldman.

The second 15 year old said the coach put his hands down her pants and pulled up her shirt to expose her breasts.

"I find it hard to believe," says Madelyn Hardy. Her daughter, Stacy, is one of the accused coache's pupils.

"It seems very out of character," she says. "I respect him."

"He is the best coach ever," adds her daughter, Stacy. "He has changed my life. He made everything better."

The training facility is equipped with cameras pointed at the practice area.

"The video is always ongoing, it never stops," says Impact Dynamic owner Rey Castillo, who is also the accused coach's brother.

There are also usually parents in the building watching practice.

"I invite the parents to be here because I have nothing to hide," says Castillo.

And the training area is one large open room.

"You have a full view of the whole court," says the owner.

Police don't say if there are any witnesses or video to support the accusations by the teenagers.

Investigators say they worry they may hear from more girls.

"That's definitely our concern," says D/Sgt. Veldman. "That there are other potential victims out there."

Rey Castillo says his brother, Florencio, is suspended from his coaching job at Impact Dynamics Training until the charges against him are resolved.