GARY, Ind. -

A coroner says it might be weeks before it positively identifies the two people killed when a small plane crashed into a wooded area about a mile short of Gary/Chicago International Airport in northwestern Indiana.

Lake County coroner Merrilee Frey (fry) says investigators from her office spent hours at the scene soon after Wednesday's crash and returned the next day to complete their recovery work.

Frey tells WLPR-FM that medical examiners will use dental records and DNA tests to confirm identities of the victims.

Aviation officials haven't yet released any information about what caused the crash. The single-engine plane was registered to Gandy AIR LLC in St. Augustine, Fla., according to Federal Aviation Administration, and had last taken off from Smyrna, Tenn.