UPDATE: The child was found on Wednesday afternoon. Click here for the latest updates.
Brown is described as a black male, with brown hair and brown eyes, last seen wearing a gray sweatshirt and gray pajamas with sharks on them.
The suspect, Phoebe Haynes, is a 44-year-old black female, standing 5 feet tall, weighing 180 pounds, with brown hair and brown eyes, last seen wearing a black jacket, a skirt, and boots. Police say she is the boy's grandmother. San Francisco police say the boy was abducted by Haynes after his mother went into a store.
Police say Haynes was last seen driving a 2004 white Acura TL, with California license plate 7HPY348. The vehicle may have a black front bumper.
The AMBER Alert is in effect for the following counties: San Francisco, San Mateo, Marin, Contra Costa, Solano, Santa Clara, and Alameda.
Anyone who sees Brown or Haynes should call 911 immediately.