All closures have reopened and most officers have cleared the area. 
Update (1:55pm): All road closures have been reopened and most officers have cleared the area.
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We are currently investigating an incident that has led to a heavy police presence in the area near the Parkside Plaza. The onramp to HWY 101 is temporarily closed from this area. Please avoid the area until we clear and use alternate routes at this time.
Address/Location
San Mateo, CA Police Department
200 Franklin Pkwy
San Mateo, CA 94403
Contact
Emergency: 9-1-1
Non-emergencies: 650-522-7700
TEXT-A-TIP - Text TIP SANMATEOPD followed by your message, to 888777
