KANSAS CITY, Kan. — A Kansas City, Kansas, firefighter and one other person were injured Friday morning after falling through the roof of a building.

Firefighters were in an industrial area near South 55th Street and Kansas Avenue to assist the police department with an investigation of an earlier incident.

A worker had fallen through a skylight on the roof of a commercial building at the TSL truck yard, Assistant Fire Chief Scott Schaunaman said, and is in serious condition.

“Those panels being weathered kind of blend into the color and consistency of the tin, so I could see it very easily where someone could doesn’t know and they just make the wrong step and fell through,” he said.

Schaunaman said later that morning investigators needed help getting on the roof, so a fire crew showed up with a ladder truck. That’s when a 19-year veteran with KCK Fire Department also fell through a weathered skylight. That firefighter was in critical condition, but is now stable.

“It’s tough. It’s emotional. It’s hard because we’re there to help people and protect people, and we did that for the earlier patient,” Schaunaman said. “But when it’s one of our own, it’s personal because it’s family. We’re like a brotherhood.”

There were several firefighters in the hospital waiting room Friday.

“I just ask anybody that’s listening, just pray,” Schaunaman said.

TSL’s corporate office is not commenting at this time. FOX4 also reached out to the Occupational Safety and Health Administration about its investigation, but we’re still waiting to hear back.