A construction worker was killed and three others hurt Thursday morning when the steel frame of a practice facility collapsed at Argyle High School.
The building was still under construction and for an unknown reason fell, trapping several people. Argyle ISD Superintendent Telena Wright said the collapse happened about an hour before school began.
"This is a terrible, terrible tragedy," Wright said.
One worker told FOX 4's Saul Garza that his crew had just finished putting up the frame on Wednesday.
He was working in a different area when he heard the loud crash. He looked over a saw the body of one of his co-workers near some construction equipment.
Officials confirmed one worker died at the scene. Two were hospitalized with unknown injuries and another was treated for minor injuries.
No students or staff members were involved or at the site at the time of the collapse, but some students did see the building go down.
"They just said the structure started to wave, the walls they started moving and soon enough it all collapsed, all sides just caved in," said Argyle HS student Annabel Thorpe.
Investigators from OSHA were on site within hours and working to determine the cause of the crash. Video from FOX 4 showed twisted beams on top of several construction vehicles.
The building was going to be used an indoor practice field for football, band and other sports. It was part of a $45 million bond package that was approved in May.
The company associated with the project was NorthStar Builders in Coppell and the subcontractor was Warnick Metal Building Erectors in Haltom City.
Argyle is about 20 miles north of Fort Worth in Denton County.
FOX 4 is on YouTube -- http://bit.ly/fox4subscribe