SMPD has taken the subject safely into custody. Expect traffic delays in the area as emergency crews clear the area. 
**Update**
SMPD has taken the subject safely into custody. He was found to be in possession of a loaded firearm. We are thankful for a peaceful resolution and patience of our community as we worked to resolve this incident.
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September 1, 2018- Please avoid the area of the 500 block of 1st Av. Delaware St, Cypress Av, and Claremont St will be closed within that area. SMPD Crisis Negotiation Team (CNT) Officers are currently speaking with a subject reported to be armed and in distress. Expect delays in the area.
Address/Location
San Mateo, CA Police Department
200 Franklin Pkwy
San Mateo, CA 94403
Contact
Emergency: 9-1-1
Non-emergencies: 650-522-7700