OAKLAND -- A 16-year-old girl who has the mental capacity of a 7-year-old has been missing from the Fred Finch Youth Center in Oakland since Tuesday night, police said.

Shyanne White was last seen at the center at 3800 Coolidge Ave. about 7 p.m., her father Jesse White said. Youth are allowed to leave and doors are not locked at the facility. The girl, who has severe autism, walked out and headed to the BART station that evening, said Fred Finch Chief Executive Officer Thomas Alexander.

The teen was followed by staff on foot and in a car to International Boulevard and 34th Avenue near Fruitvale station, where they lost sight of her, police said.

Her father said she does not have the mental capacity to buy a BART ticket or board the train on her own.

Police are asking for the public's help finding her.

She is Caucasian, 5 foot 4 and weighs 150 lbs. with shoulder length brown hair and brown eyes. She was last seen wearing a pink shirt, blue hooded sweater with pink stripes, blue yoga pants and blue Converse tennis shoes, police said.

Anyone with information on the whereabouts of Shyanne is asked to contact the Oakland Police Department Family Youth Service Division at 510-238-3641.

Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender.