JOHNSON COUNTY, Iowa -- The National Transportation Safety Board has released its preliminary report of a deadly plane crash near near Iowa City.
Two people on board were killed after leaving the airport in Oxford last Friday. The NTSB said the pilot did not file a flight plan.
A witness told investigators that he heard the engine popping, then it looked like the plane stopped moving before entering a downward spiral and nosediving into the ground.
Seventy-year-old Terry Koehn of Iowa City and 56-year-old James Spicer of Cedar Rapids died in the crash.
Investigators are still working to determine an exact cause the crash.