Pleasanton police this week arrested a 16-year-old boy on suspicion of committing armed robbery in the Stoneridge Shopping Center parking lot last month.
Detectives arrested the unidentified teenager Monday after he appeared in court on charges stemming from a separate matter, Pleasanton Sgt. Larry Cox said Tuesday.
The Pleasanton incident occurred on Dec. 20, when a woman reported to police that she had been robbed at gunpoint in the "A" parking lot of the mall around 11:30 a.m. that day.
A young man walked to the front of the woman's car and acted as a lookout while another yanked open the driver's door, pointed a black handgun at the woman and demanded her belongings, Pleasanton police said.
The woman handed over her belongings, and the robbers fled in a waiting car described as an older, green Honda Civic or similar model vehicle.
As detectives followed up on the case, they heard from a citizen who had written down the license plate of a green Honda Civic parked at Stoneridge just prior to the robbery because they believed it was suspicious, Cox said.
The resident gave the license plate number to police, who discovered the car was reported stolen from the Concord BART station and had recently been recovered by the Pittsburg Police Department after a pursuit. A male juvenile in possession of a black handgun was arrested following the pursuit, Cox said.
Pleasanton police said the local robbery victim subsequently identified the 16-year-old as the person who pointed the handgun at her and demanded her belongings.
Pleasanton police detectives arrested the teen Monday following his court appearance for the pursuit. After his arrest, the 16-year-old was questioned and later booked at the Alameda County Juvenile Hall.
"This arrest would not have been possible without the awareness of this observant citizen and their willingness to contact the police," Cox said.
It was not immediately clear whether police were still looking for the second person reportedly involved as a lookout during the Dec. 20 robbery.