TUCKER, GA — Three children and a man are dead in a possible murder-suicide Wednesday in the 4600 block of Britt Road, Gwinnett County Police said.

An officer was conducting an area check around 1 a.m. at Lucky Shoals Park, where he found a "suspicious vehicle" parked near a pedestrian trail, police said.

When the officer called out to the car's occupants, he received no response, police said. After approaching the car, police said the officer saw four people dead inside of the car.

The identities of those who died were not released. A motive in the case is unknown, and a manner of death is unknown.

Police said the man who died was the driver, and the children who died were two girls and a boy who seem to be of elementary and middle school ages.

"At this time, detectives are investigating this case as a possible murder-suicide, but final determination will be made by the Medical Examiner’s Office," police said in a news release.

Police did not release further details.