The initial discovery happened on Monday, just after 4 a.m. at a commercial property near Old Bayshore Highway and highway 101.
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Photo evidence, surveillance video released of SJ explosion suspect
There they found what appeared to be a destructive device manufacturing operation.
Police then identified a suspect as Adam Mirassou, who was arrested at his house and booked into the Santa Clara County Jail.
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Officers found more explosive materials at his home. In total, they found precursor explosive-making materials, assembly equipment, and completed explosives.