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The discovery was made around 1 p.m. Monday outside of a department's Special Operations Bureau at 17th and De Haro streets in the Potrero Hill neighborhood.
In total, two marked police trucks and two marked police vans had their catalytic converters stolen.
So far no arrests have been made.
VIDEO: Brazen videos capture Bay Area catalytic converter thieves in the act
Videos capture Bay Area catalytic converter thieves in the act