Winds that were just shy of tornado strength, and perhaps stronger, ripped through the roof during a Dallas Cowboy rookie mini camp practice, essentially popping the so-called bubble. Between the falling debris and the furor to get out, special teams coach Joe DeCamillis broke his back and 11 more people were hospitalized.

About 60 others felt lucky to escape with only cuts and bruises.

"I saw it coming down and didn't have time to react," secondary coach Dave Campo said. "I hit the ground and was able to get back up."

DeCamillis, hired a few months ago, is likely to need surgery to fix "a couple of broken vertebrae" in his lower back but is expected to recover, said his father-in-law, Dan Reeves, the longtime NFL coach.

"Right now, I think we don't have anybody who is in a life-threatening situation," said Dr. Paul Pepe, head of emergency medical services for Dallas County.

Those with more serious injuries included a person with a head injury, one with an open fracture below the knee and someone who was impaled with metal, said Tommy Gonzalez, Irving's city manager.

Just before the facility was flattened, wind was clocked at 64 mph, a single mph shy of the threshold for a weak tornado. However, National Weather Service meteorologist Gary Woodall said a "microburst" may have pushed the wind beyond 70 mph at the top of the structure. A microburst also was to blame for a 1985 Delta Airlines crash at nearby DFW airport that killed 137 people.

"The fact that there weren't more injuries is rather miraculous," Woodall said.

Eatman and colleague Josh Ellis tried freeing Archer but the structure wouldn't budge. "It was like a car," Eatman said. Then safety DeAngelo Smith and linebacker Brandon Williams managed to lift it just enough for Archer to squirm out.

"I was trapped. I couldn't move," said Archer, who figures he was down 20 to 25 seconds. "Then those guys lifted it up--not very far, but I was able to move from my side to my back. ... Once I got out of there, I looked back and the whole thing was down."

Eatman said one of the swaying lights wound up more than two football fields away. The giant blue star atop the building lay crumpled on the ground. The storm knocked out power at team headquarters and splintered trees across the property. Power was out at team headquarters for about an hour.

"We're lucky no one got electrocuted with all the water in the building," head coach Wade Phillips said.

Larry Rodriguez, a television cameraman who in 2005 was attacked by Kenny Rogers while filming the former Texas Rangers pitcher, received six stitches to close a cut on a hand.

Associated Press writers Jamie Stengle and Schuyler Dixon in Dallas contributed to this report.