Police expanded their frantic search for missing teen Sebastian Rogers more than a week after he mysteriously vanished from his northern Tennessee home.

Sebastian, a 15-year-old with autism, was last seen by his mother when she put him to bed the night of Feb. 25, according to WZTV-TV.

"When I told him to go to bed, he was like, 'I love you mom, I love you puppies,' and he went to bed; and I went to bed around midnight, and everything seemed fine, and when I went to wake him up for school, that's when I couldn't find him," Sebastian's mom, Katie Proudfoot, explained to the station earlier this week. "He wasn't in his room."

On Thursday, the hunt for Sebastian led investigators to a Kentucky landfill, where the trash from his Hendersonville, Tennessee neighborhood was dumped, WKRN-TV reported. 

The search "yielded negative results," the Sumner County Sheriff's Office confirmed.

"While we had hoped for a different outcome, our commitment to finding Sebastian remains unwavering," Sumner County Sheriff Sonny Weatherford said in a statement Friday. "We will continue to explore all available avenues and resources to bring closure to this case and provide answers to Sebastian's family and loved ones."

(Photo : Sumner County Sheriff's Office) Sebastian, a 15-year-old with autism, was last seen by his mother when she put him to bed the night of Feb. 25, according to WZTV-TV.

On X, former FBI agent Jennifer Coffindaffer weighed-in on investigators' brief, two day search of the landfill.

"It took the FBI 4 weeks of tireless searching to find #QuintonSimon in a landfill," she wrote.

"LE are done in 2 days searching for Sebastian in a landfill... This doesn't make sense," Coffindaffer criticized.

Authorities described Sebastian as a white male, 5-foot-5-inches tall, 120 lbs, with brown hair, and brown eyes. He was last seen wearing a black sweatshirt, black sweatpants, and glasses.

Multiple agencies, including the Tennessee Bureau of Investigation, are coordinating efforts to track down the missing teen.

Anyone with information on his whereabouts is urged to contact the Sumner County Sheriff's Office at 615-451-3838 or TBI at 1-800-TBI-FIND.