Michigan law enforcement officials remain confident they will determine what happened to a newborn infant found dead inside a portable restroom at the Electric Forest music festival last month, according to new reporting by Katie Bain of Billboard.

“This is high priority,” Michigan State Police Lt. Pat Agema told Bain, adding that investigators believe the case “will be solved.”

The infant was discovered on the morning of June 28 by an employee performing routine maintenance on a portable restroom in the camping area of the annual festival in Rothbury, Michigan. Electric Forest, held at the Double JJ Resort, attracts tens of thousands of electronic-music and jam-band fans each year.

As Bain reports for Billboard, the discovery has left festival attendees searching for answers while investigators work to identify the infant and determine who was responsible for the child’s death.

Preliminary autopsy findings indicate that the infant was viable and born alive, according to information cited in Bain’s report. Authorities have released few additional details about the child, including the infant’s gender and official cause of death.

The Michigan State Police investigation is now being assisted by the FBI’s Detroit Field Office. Earlier this month, the FBI announced a reward of up to $15,000 for information leading to the identification, arrest and conviction of the person or people responsible.

According to Bain’s reporting, investigators are examining forensic evidence and reviewing video as they follow up on tips from the public. Agema expressed confidence that forensic work will ultimately help authorities solve the case.

Police have questioned at least one woman from Muskegon who attended the festival, but she cooperated with investigators and was eliminated as a suspect, Bain reports. Authorities have not publicly identified any other suspects or persons of interest.

The investigation presents a significant logistical challenge because Electric Forest draws a large, transient population to a sprawling festival and campground. Many attendees had already begun leaving the site by the time news of the discovery became public. Investigators must now sift through potential witness accounts, photographs, videos and other evidence generated during the four-day event.

Bain’s Billboard report also captures the uncertainty that has persisted among festivalgoers since the discovery. Attendees have discussed the case online and attempted to understand how an infant could have been delivered and left inside a portable restroom without the circumstances immediately becoming known.

Law enforcement officials have discouraged speculation and emphasized that even information that appears insignificant could help investigators reconstruct what happened.

Electric Forest organizers previously said they were “heartbroken” by the discovery and urged members of the festival community to assist authorities. The festival has not been accused of wrongdoing in connection with the death.

The case remains active, and no arrests have been announced. Authorities have also not publicly classified the death as a homicide.

Anyone with relevant information can contact Michigan State Police through the state’s tip-submission system or by calling 1-855-MICH-TIP. The FBI is also accepting information connected to the investigation.