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Four men in critical condition following Kentucky plane crash

Four men were taken to the hospital after a plane crash in Louisville. NBCNews.com's Alex Witt reports.

Four men remain in critical condition after their small plane crash landed on a Kentucky golf course Tuesday evening, according to a spokesman for the University of Louisville Hospital.

The plane, a four passenger Cessna 172 aircraft, crashed near the 18th hole on the Seneca Golf Course in Louisville, according to report filed by the Federal Aviation Administration.

The plane was registered to Cardinal Wings Aviation LLC, a flight school in Louisville. Preliminary observations indicate that the aircraft was practicing takeoffs and landings when the accident occurred.  

The plane has not been involved in any prior accidents or incidents, the FAA said.

The National Transportation Safety Board is looking into probable causes for the crash.