Police responded to a report of a robbery involving a man armed with a gun at 10:43 a.m. on the 1300 block of Gateview Avenue.
The suspect reportedly fled into a residence on the 1200 block of Mariner Drive.
Officers set up a perimeter around the home, and street closures were in effect at Mariner Drive and Gateview Avenue. Muni buses were being rerouted due to the incident.
No further details were available.