A Celina man who allegedly told elementary school officials he had a gun as part of an experiment on school safety is facing third-degree felony charges.

School officials said Ronald Miller went to Celina Elementary School, where his child is a student, on Wednesday and claimed to have a gun.

Administrators said Miller first approached a school greeter with whom he was acquainted and said he had a gun.

"He told her he was a gunman and his target was on the inside -- and 'I'm going inside. What are you going to do about it?'" Superintendent Donny O'Dell said.

O'Dell says the school greeter froze in panic, allowing Miller to walk through the school's front door while children were entering the building for the school day.

Miller then entered the office and made similar threats, he said.

"He told them that he is a shooter and 'you're dead, and you're dead,'" O'Dell said.