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Nearly two dozen children were injured when a stairwell collapsed at an indoor obstacle course gym in California Saturday night, San Diego Fire-Rescue said. The San Diego Fire Department said the injuries were considered minor to moderate. Children were also running up and down the stairwell to get pizza just before the incident, another parent told the newspaper. Three or four may have suffered spinal injuries and were immediately transported to the hospital in "more serious" condition, SDFD spokesperson Steve Wright said.

The police also dug out a woman from under the rubble, the San Diego Union-Tribune reported.

Wright said it's unclear if the number of people or the construction of the platform contributed to its collapse.

Video from the scene showed parents arriving at the gym to be reunited with their kids.

Emergency vehicles outside of Vault PK in Barrio Logan. Many parents were probably using a Groupon that had been offered for the event.

Besides paintball, the warehouse includes trampolines and bouncy houses.

"It was a freak accident", Zachary Smith, who was standing on the platform at the time it fell, told the Los Angeles Times. Following the incident, one of their children called them up, and that is when they rushed back to the facility. I am just as devastated for all the children affected as any other parent. The gym specializes in parkour, which is a sport that requires athletes to navigate obstacle courses.