Fire investigators are looking into the cause of a three-alarm fire that engulfed the home of San Francisco dog walker Terry Williams.  

As KCBS Radio's Matt Bigler reports, Williams had recently reported a string of racist threats, causing many to wonder if the fire is related.

<p>Fire investigators are looking into the cause of a three-alarm fire that engulfed the home of San Francisco dog walker Terry Williams.  </p>
<p>As KCBS Radio's Matt Bigler reports, Williams had recently reported a string of racist threats, causing many to wonder if the fire is related.</p>

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