JACKSONVILLE — Illinois State Police are investigating an alleged sexual encounter between Illinois School for the Deaf students at the institution, as well as a video depicting the act that was posted on an adult website.

State Police apparently were investigating the alleged April incident and related online video before The State Journal-Register inquired this week.

ISP Master Sgt. Mike Link, in an email responding to questions from the newspaper, said State Police are “currently investigating an alleged incident that occurred in April involving a video recorded at the Illinois School for the Deaf in Jacksonville.”

Link added: “Further information has recently been brought to the attention of the ISP involving the video, and we are currently investigating the new information, as well. This is an ongoing investigation, and no further information is available.”

The School for the Deaf is part of state government and receives more than $18 million per year in state general revenue funds to educate about 200 deaf students in pre-kindergarten through high school and in a transitional living program for young adults. Some of the school's students live on campus, and some commute from their homes in Illinois communities.

Sex between underage people can be prosecuted as a misdemeanor in juvenile court.

And under Illinois law, creating child pornography or sharing it with an individual or a website can result in felony charges against juveniles or adults that can be prosecuted in juvenile or adult court.

Meghan Powers, spokeswoman for the 179-year-old School for the Deaf and the Illinois Department of Human Services, had no comment on the allegations.

A call to the school’s superintendent, Julee Nist, was referred to Powers.

Jacksonville police referred complaints about underage sex at the school and a related video to State Police in April and last week, Jacksonville police Deputy Chief Rodney Cox said.

Cox said Jacksonville police received a complaint from a member of the public last week involving an adult website video depicting sex between a male and female in what appears to be a bathroom or shower room, and referred the issue to State Police. The video was available on the website last week but has since been removed.

As of Friday night, the video was listed as having more than 1,300 views. It’s unclear when the video was first posted on the site.

As of Tuesday, the site still listed the title that had been displayed with the video. That title contains the first names of a male and female, along with “Illinois School for the Deaf.”

Morgan County State’s Attorney Gray Noll wouldn’t comment on the case.

The Illinois Association of the Deaf, an advocacy group, wrote a letter Monday complaining about the video to state officials including Gov. Bruce Rauner, Illinois Superintendent of Education Tony Smith and Human Services Secretary James Dimas.

The letter says the association’s executive board members write “from a place of great concern for the welfare and safety of the students at Illinois School for the Deaf.”

The video was “allegedly filmed in one of the bathrooms at ISD,” according to the association’s letter.

Because of “the number of reports” received from deaf people in recent years regarding the education and treatment of the school's students and conduct of administrators and staff members, the letter says, “we are concerned with the social and emotional well-being of ISD students.”

“We request a thorough investigation and for those responsible for the students’ welfare and safety to be held accountable,” the letter says.

Claire Rawlings, 44, a former Jacksonville resident and mother of four ISD students — triplets in first grade and a son in fifth grade — said she complained to the school’s superintendent on Monday about the video.

Rawlings said she lives in Fishers, Ind., while her ex-husband lives with the four ISD students in Jacksonville.

Rawlings said she found the video “disgusting.” The filming of the video raises questions about adequate supervision of students at the school at 125 Webster Ave., she said.

“I’m really concerned,” Rawlings said.

She said she has been dissatisfied with many aspects of the school’s operations, and the video is her latest source of frustration.

“I don’t feel like it’s a safe environment,” Rawlings said.