A lightning strike in the parking lot at Pocono Raceway after a NASCAR race Sunday killed one person and injured nine others, racetrack officials said.

It wasn't immediately clear if all 10 people were actually struck by lightning in the parking lot behind the grandstand, nor was it known whether one or multiple strikes occurred.

Two people were taken to the hospital in critical condition after the strike, racetrack officials said. President Brandon Igdalsky said one of them later died at Pocono Medical Center, but he provided no further details.

"Unfortunately, a member of our raceway family here, a fan, has passed away," he said.

One person remained hospitalized in critical condition at Lehigh Valley Hospital Center, said Bob Pleban, a track spokesman. The other five people were taken to various hospitals with minor to moderate injuries, he said.

The race was called because of rain, with 98 of the 160 scheduled laps completed. The track posted warnings on its Twitter page near the end of the race encouraging fans to "seek shelter as severe lightning and heavy winds are in our area."