Neighbor says case of found remains, detained teen is 'horrifying'

Body found believed to be missing grandma, teen still missing and ...

Mott told police officers that he couldn't find French, 53, his son, a silver Dodge Dart or his guns. The boy was believed to have taken a week's supply of medicine, and also stolen his grandmother's vehicle and driven hundreds of miles north to Pennsylvania, where a surveillance camera had spotted him the previous day.

It's a tragic update in the days-long search to find a missing 15-year-old and his grandmother.

Armed and risky, the 15-year-old had stolen a vehicle and was being sought as a "person of interest" in respect of the murder of his grandmother, a woman of 53-year-old whose body was found earlier this week in the city of Neptune Beach, in the suburbs of Jacksonville.

The teen was spotted on surveillance video in Pennsylvania driving the missing auto on Thursday.

Pictured Neptune Beach, Florida teen, Logan Mott and his grandmother, Kristina French.Logan Mott is to date only a person of interest not a suspect, but damning evidence mounts.

Logan, who is diabetic, didn't go to Sandalwood High School in Duval County on Monday or Tuesday.

"We are relieved he is safe and in custody and we just ask for everyone to give us time to sort out what happened", she wrote. "No matter what, Logan is our child and we love him and are standing by him to help in any way". They call him "armed and risky". The home was found ransacked with the door open and guns missing from the safe when Mott's father and girlfriend returned, opting to take an Uber ride back home when his son failed to show up.

Eyewitness News is working to get more details on the story. "So it's just baffling", Carrie Campbell-Mott said.

Authorities have yet to say what may have led to the teen's possible involvement, directly or indirectly with his grandmother death and whether there had been prior episodes between grandmother and grandson?

She the station that the last time she spoke to her son was Sunday night, and everything seemed fine.

He had not called his mother and come home, but had instead traveled all the way from Neptune Beach to near Buffalo, where federal agents detained him at the Canadian border.