3 Marines Found Dead Inside Car Parked at North Carolina Gas Station: 'Tragic Loss'

The Marines were identified as Tanner J. Kaltenberg, 19, Merax C. Dockery, 23, and Ivan R. Garcia, 23

Three men found dead Sunday at a gas station in North Carolina have been identified as Marine lance corporals stationed about 30 miles from Camp Lejeune.

The Pender County Sheriff's Office said in a statement that the men were found dead around 9 a.m. inside "a vehicle located at the Speedway convenience store in Hampstead, North Carolina." The discovery came after a report of a missing person was filed, the sheriff's office said.

An autopsy performed by the North Carolina Office of Medical Examiner found that "all three deaths are consistent due to Carbon Monoxide Poisoning," police said in a statement on Wednesday.

Related: Mummified Remains Found at Remote Colorado Campsite Identified as Two Sisters and Teen Boy 'Living Off Grid'

Before the autopsies were completed, their cause of death was not immediately known. Sgt. Chester Ward of the Pender County Sheriff's Office previously told the Associated Press that the cause of death "might be something that we don't see."

Ward said at the time that no drugs were found in the vehicle and that they "do not suspect any foul play in that matter." The department added that "there does not appear to have ever been any threat to members of the community."

The sergeant told The New York Times that they did not appear to have died by suicide and that it "seemed like it was more like an accidental death.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

The men were identified as Tanner J. Kaltenberg, 19, of Madison, Wisconsin; Merax C. Dockery, 23, of Pottawatomie, Oklahoma; and Ivan R. Garcia, 23, of Naples, Florida, the U.S. Marine Corps said in a statement obtained by PEOPLE on Wednesday.

Related: Mass. Marine Reservist Reunited with Special Boot-Camp Ring After Losing it Playing Basketball

"My deepest sympathy and condolences are extended to the family, friends, and colleagues of Lance Cpl. Kaltenberg, Lance Cpl. Dockery and Lance Cpl. Garcia," said Brig. Gen. Michael McWilliams, commanding general of the 2nd Marine Logistics Group. "Our focus is providing the necessary resources and support to those impacted by their tragic loss as they navigate this extremely difficult time."

According to the statement, the men were motor vehicle operators with the Combat Logistics Battalion 2, Combat Logistics Regiment 2 and 2nd Marine Logistics Group at Camp Lejeune.

The Pender County Sheriff's Office and the Marine Corps said an investigation into their deaths is ongoing.

For more People news, make sure to sign up for our newsletter!

Read the original article on People.