A 20-year-old man was killed and three other people were injured apparently by lightning early Saturday at Pomona State Park, the Osage County Sheriff's Department said.

The fatality victim, whose identity hasn't been released, was camping with friends and was thought to have been struck by lightning between 1 and 4 a.m. as thunderstorms rolled through the area, a deputy said. He was discovered by another person at the park.

The sheriff's department and the Kansas Department of Wildlife and Parks are investigating the death.

The three injured people were transported by ambulance to Overland Park Regional Medical Center. Neither their names nor conditions were known.

The incidents follow a May 10 lightning strike that injured a 15-year-old girl who was showering in her home on N.W. Valencia Road. Fire officials said a lightning bolt struck the ground near the girl's house and somehow traveled through the building's steel plumbing, striking her through the shower nozzle.

Forty-five people were struck and killed by lightning in the United States in 2007, according to the National Weather Service.