TOPEKA, Kan. (AP) — Kansas firefighters found a man on fire inside a restroom at a Walmart store this weekend.

Topeka city spokeswoman Gretchen Spiker told the Topeka Capital-Journal that firefighters found the man when they went to a Walmart Neighborhood Market around 8:15 p.m. Saturday.

“Upon arrival, firefighters located an adult male on fire in a bathroom,” she said. “TFD personnel immediately worked to get the fire out, and rendered aid to the involved individual.”

The man was taken to a Topeka hospital with serious injuries. He wasn’t immediately identified.

Spiker said investigators are working to determine how the fire started.