An armed teenager was fatally shot by an officer in South San Francisco Tuesday night, according to police.
Officers stopped two pedestrians about 9 p.m. near the 2300 block of Westborough Boulevard when one of the officers saw the man had a gun, according to police reports.
One of the officers shot 15-year-old Derrick Gaines and then began to administer First Aid.
Gaines was taken to a local hospital where he was pronounced dead.
The officers reported that they initially stopped the two teenagers because they saw them acting in a "suspicious manner."
South San Francisco Police Department Chief Mike Massoni expressed his condolences over Gaines death.
Captain Mike Brosnan said the department will conduct a "transparent investigation" into the "tragic event."
The city's last officer-involved-shooting was more than 30 years ago in 1981.