The Thursday evening report said the circumstances causing the 1969 Cessna 172 to crash are still unknown. The FAA and the National Transportation Safety Board will further investigate.

A preliminary investigation revealed both motorcyclists were riding north on Illinois Route 394 when one victim rear-ended the other, causing both to crash.

PORTER COUNTY — A motorcycle driver and his juvenile passenger were seriously injured in a hit-and-run crash involving a pickup truck Saturday afternoon, the Porter County Sheriff's Office said.