FBI Director James Comey says findings in a sweeping federal investigation into the California mass shooting indicate the two suspects showed signs of radicalization but were not part of a broader network.
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One moment, Syed Rizwan Farook was sitting at a table with colleagues at a holiday gathering for county health employees. Then suddenly he disappeared, leaving his coat on his chair. The next time his co-workers saw him, he was dressed in battle gear and wielding an assault rifle.