Police have not said why the former student came to the school armed with a gun on a day when students were rehearsing for their upcoming graduation ceremony.
When we contacted the Dixon Police Department, they said they could not confirm or deny the report.
Dixon is a central IL city about 100 miles west of Chicago.
According to the statement, no one other than the suspected shooter and Dallas were injured in the incident. He says the gunman is in custody with non-life-threatening injuries.
At the end of the news conference, Dixon School District Superintendent Margo Empen thanked law enforcement and the community for their support, and to parents, students and staff for their bravery.
"I could not be more proud of the police officer and the way he responded to the situation". The male was believed to be a 19-year-old former student at the school, Lee County Sheriff John Simonton told Sauk Valley Media. "His fearless actions saved a lot of lives", Langloss said. Dixon Police Chief Steven Howell credits active shooter training with preventing casualties.
The students are being bused from The Armory to Al Morrison Baseball Field.
Howell said that students and staff at the school appeared to have acted coolly under stress during the incident. While not every situation will end like IL, it seems pretty clear that armed guards at schools can and do prevent further loss of life when someone plots to commit a school shooting.