Fairfield police said a 16-year-old boy was dead and an 18-year-old man was taken to the hospital after the incident around 5 p.m. near Armijo High School, KRON reported.
Fairfield police arrested two people in connection with the deadly shooting after receiving reports of a "gun battle" between two groups of people, The San Francisco Chronicle reported.
"We do know that there were multiple shooters and it appeared that the groups were shooting at each other," Lt. Greg Hurlbut of the Fairfield Police Department told KGO.
Police found and arrested the two suspects within an hour, the television station reported.
It is not known whether the suspects and victims were students at the school, the Chronicle reported.