Three weeks after an Illinois police officer was shot to death, investigators have revealed little about their investigation.

Authorities say they are still awaiting lab tests in the death of Charles Joseph Gliniewicz, despite the urgency with which police slayings are usually handled.

The coroner says he has been unable to rule the case a homicide, a suicide or an accident — a stance that has deepened longstanding tensions between him and local law enforcement in the village of Fox Lake.

Police have made no arrests or identified any suspects. The apparent lack of progress leaves the public in the dark about whether there's a killer on the loose.

The coroner and the chief investigator were to meet in person this week for the first time to discuss the matter.