The body of Faye Marie Swetlik, a 6-year-old girl who mysteriously vanished in front of her South Carolina home Monday, has been discovered and her death is being treated as a homicide, investigators said.

“It is with extremely heavy hearts that we are announcing we have found the body, who the coroner has identified, as Faye Marie Swetlik,” Cayce Public Safety Director Byron Snellgrove said during a brief news conference Thursday afternoon.

No arrests have been made, he said, adding that the investigation is fluid. He did not say where the body was located or give a cause of death.

Snellgrove also announced that during the investigation a deceased male was located in the Churchill Heights neighborhood, which is also being investigated. It was unclear whether that was linked to Swetlik's disappearance.

Investigators were last looking for the drivers of two unfamiliar vehicles seen in the Churchill Heights neighborhood of Cayce, S.C., around the time Faye was last seen.

The Cayce Department of Public Safety late Wednesday released new video of the cars, which appear to be a Chevy Trailblazer SUV and a silver sedan. Police later said they identified the SUV and were continuing to search for the sedan.

No evidence has pointed to a kidnapping, but investigators said they have not ruled out abduction or other possibilities, like she walked away from her home or was harmed by someone she knew.

The 3-foot-10 inch, 65-pound first-grader vanished around 3:45 p.m. Monday shortly after getting off her school bus. She was last seen playing in front of her home. Family searched for Faye for about an hour before calling 911, authorities have said.

“Her mother, her mother’s boyfriend and her father have all been cooperative with us," Cayce Public Safety Director Byron Snellgrove said.

Police released video of the 6-year-old exiting the bus in her last known outfit: polka dot rain boots, a pink flowered skirt, and a black T-shirt with a neon design and the word “PEACE” written on front. She recently had her hair cut to shoulder-length.

Investigators have said that in the course of the first 72 hours, more than 250 officers from multiple agencies were sent out to canvass the neighborhood, going door-to-door to every house and even searching some homes. Hundreds of hours of video were scrutinized and witnesses interviewed.