PLEASANT HILL (KRON) — Pleasant Hill police are searching for a runaway teen girl on Friday, police said.

Police said she was last seen at Alhambra High School in Martinez on Thursday. Fifteen-year-old Jenna Graves did not return home after school, according to Sgt. Ron Priebe.

She is believed to have taken a bus from the Alhambra Avenue area at around 2:30 p.m. Thursday to the Concord BART station. Her cellphone is off, police said.

Police said she looks older than 15 but is developmentally disabled and has the mentality of a 10-to-12-year-old. She is described as being 5 feet 3 inches tall, weighing about 165 pounds, with reddish brown, should-length hair.

She has a tracheotomy scar on the front of her neck, police said, and she tends to wear lots of makeup. She is usually dressed in dark clothing.

She also has a blue and gray backpack, police said.

If you have any information, you’re asked to call police at (925)-288-4600.