A 17-year-old with autism and a medical disorder involving seizures was reported missing in San Diego on Monday.
Guillermo Gradillo was last seen in the 600 block of 67th Street just before 1 p.m. He ran away from his aunt's residence, according to the San Diego Police Department (SDPD).
His aunt believes Gradillo may have gone to Tijuana because that's where his mother lives. She said he also may have gone to see his father in Los Angeles.
The teen has a history of running away from home. Police said, in previous cases, Gradillo has been found in Tijuana, San Diego and Orange County.
He knows how to use public transit but police said Gradillo has no money or any means to support himself. Gradillo did not take a cellphone with him when he ran away.