The Amber Alert had been issued after a car was stolen from a Jack in the Box parking lot in the 6600 block of Alondra Boulevard just before midnight Thursday. A teenage boy with autism was in the back seat of the vehicle, authorities said.
The teen was identified as 17-year-old Frankie Barboa, who has the mental capacity of a 7 to 12-year-old. Barboa's adult sister had stepped away from the vehicle and returned to find that the car and her brother had disappeared, said Deputy Kimberly Alexander of the Los Angeles County Sheriff's Department.
The vehicle was a black 2015 four-door Honda Civic with California license plate No. 7LGH091. The car has gray rims, a cracked windshield and blue lights around the rear license plate, according to investigators.
At about 8:30 a.m., someone who had received information about the Amber Alert called authorities saying that they believed the vehicle was parked outside their house in Paramount. Officers responded and confirmed that it was the vehicle.
Within minutes, detectives also received notice that the teen was safe at his house.
"(Detectives) confirmed that Frankie was located; he was unharmed," sheriff's Lt. Charles Calderon said.
The teen also told authorities that the suspect was kind to him. After the female suspect ditched the vehicle, the teen took public transit to return home. The suspect remains outstanding.