Indiana State Police spokesman 1st Sgt. Dave Bursten said a preliminary crash investigation leads "us to believe that this was an intentional act."
The crash killed Eric Johnson, 47, of Connersville, and his daughter Emily, he said. The plane crashed into the residence of one of Johnson's in-laws, Bursten said, reports AP.
Authorities will not know for sure until the National Transportation Safety Board completes its investigation, which could take up to a year, Bursten said.