No charges will be filed in the Westfield High School stage collapse that injured 17 students in late April, the Hamilton County Prosecutor's Office announced Tuesday.

All but one of the 17 students who were injured in the April 23 collapse have returned to school.

Westfield Schools Superintendent Dr. Mark Keen said the corporation has launched an internal investigation to find out who improperly rebuilt the stage.

The incident happened around 10:30 p.m. April 23 when the stage gave way under the weight of dozens of students, who were performing the finale of "American Pie," a rock concert, to a sold-out auditorium of 900.

As they sang a cover of Journey's "Don't Stop Believin'," a large group of students ran onto the stage, started dancing, then fell 12 feet into an orchestra pit below, sending up a cloud of dust.

"I watched it all cave in," said Westfield music student Blake Rice.

Rice had just stepped off the stage when it collapsed under his classmates. Audience members called 911.

"Hi, I am at Westfield High School right now and there is a huge big 80's musical performance in the auditorium and all the kids came up for the last number and the whole stage collapsed and there are just tons of kids down in the pit. I don't know how they are doing but there are tons of adults helping them right now. But we need like, just send lots of people I think. This is huge," a caller said.

"Can you tell how many people might be injured or anything like that?" said the operator.

"No, I can't. But the whole cast came up to the front of the stage and jumping around and singing their last tune, so it's possible that there were like 30 kids that fell into the pit," the caller replied.

"For me, it was kind of shock more than anything else," Rice told Eyewitness News.

The school corporation immediately launched an investigation, involving a forensic engineer and a criminologist. Investigators found that the stage had no support beams underneath it because of a January redesign.

In January, auditorium director Quinton James purchased building materials and with the help of students, constructed an orchestra "pit lid" or cover. The previous pit lid and support system was removed.

The stage later collapsed because the lid was not properly secured to the structure and the support system was never replaced.

The stage had been used for rehearsals several times prior to the April 23 incident.

After processing the scene and talking to victims and witnesses, police announced Tuesday they found no criminal intent.

"I definitely agree with their decision and I am very happy for it," Rice said.

Keen said the internal investigation will continue. According to the initial investigation, no charges were filed against the school employee because "the failed construction and maintenance of that stage did not rise to the level of criminal culpability.

"I have been around for a while," Keen said. "We are going to do the right thing. We think our parents deserve that and our students deserve that. We are going to do everything we can based on what information we get in our investigation. This is not going to be forget about in three weeks and maybe this goes away."

Keen says so far, he has not received any legal action stemming from the stage collapse, but he expects that to happen.