Autopsies were inconclusive on two people who died after being found unresponsive inside a parked car Thursday morning in west suburban St. Charles.

Officers were called at 8:08 a.m. to a report of a suspicious vehicle in a parking lot in the first block of North 17th Street, according to St. Charles police.

A man and woman, both 18, were found in the back seat, and were taken to Delnor Hospital in Geneva, where they were pronounced dead.

The Kane County coroner identified them as Kody R. Dietrich, of the 1600 block of Indiana Street in St. Charles; and Adalina Elizabeth Donoso, of the 200 block of Leudtke Avenue in Racine, Wisconsin.

“There was no obvious indication as to the cause of death,” police said.

Autopsies performed on Friday were inconclusive, with results pending toxicological testing, the coroner’s office said.