UPDATE 7:30 p.m.: Deputies are working to clear the scene, and the road should be reopened at approximately 7:45 p.m.
It is still unclear what the unknown substance was, or whether it is considered hazardous.
A puppy was removed from the residence and was placed in the custody of animal control.
We will update with further information as it becomes available.
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UPDATE 5:15 p.m.: According to Captain Daniel Gonzales, an unknown substance was detected during a call for service that was originally set off by an alarm.