CINCINNATI — A man who apparently entered a restricted area to retrieve his lost keys at a theme park in Ohio was critically injured when he was struck by a steel roller coaster, police and park officials said.

The 38-year-old man appeared to have entered a fenced area at Kings Island Wednesday night, according to a statement issued by the park near Cincinnati. He was found on the ground with an injury, but details on his condition were not been disclosed. He remained hospitalized.

The man dropped his keys while riding the Banshee, an inverted roller coaster where the train dangles from the track, and then went into the restricted area and was struck by the coaster, according to Mason police.

According to the park’s website, the Banshee is the world's longest steel inverted roller coaster and reaches speeds of 68 mph (109 kph).

The roller coaster was shut down and will remain closed while the investigation continues. No other injuries were reported.

The park is in Mason, which is about 24 miles (38 kilometers) northeast of Cincinnati.

Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail. Credit: Anthony Florio; File Footage; Photo Credit: Newsday / James Carbone, John Paraskevas; AP / David Bookstaver, Clark County Sheriff's Office, Richard Drew, Mitchell Tapper, Don Ryan; Peconic River Sportsman’s Club / Kerry Goldberg

'He will be ... coming out of prison in a body bag' Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail.

Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail. Credit: Anthony Florio; File Footage; Photo Credit: Newsday / James Carbone, John Paraskevas; AP / David Bookstaver, Clark County Sheriff's Office, Richard Drew, Mitchell Tapper, Don Ryan; Peconic River Sportsman’s Club / Kerry Goldberg

'He will be ... coming out of prison in a body bag' Suffolk County Sheriff Errol Toulon Jr. spoke with NewsdayTV's Ken Buffa about what life is like for the Gilgo Beach serial killer Rex Heuermann in jail.

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