TULSA, Okla. (AP) - The National Transportation Safety Administration says the pilot and the Federal Aviation Administration share the blame for a plane crash near Miami that killed the pilot.

Seventy-two-year-old Clair Tromsness of Quapaw died April 28 when the experimental plane crashed onto Interstate 44 and exploded.

An NTSB preliminary report released Thursday says Tromsness was taking at least six prescription drugs and that each could have affected his ability to pilot the aircraft.

The report says Tromsness failed to control the airplane for undetermined reasons.

The NTSB says contributing factors were Tromsness' use of medications, and/or his multiple medical conditions and the failure of the FAA to follow up on his reported use of medications.