The quoted link is CBS in San Francisco. The article includes a further link to this photo provided courtesy of PG&E (Pacific Gas & Electric, a public utility company).
https://mobile.twitter.com/engineco16/status/1397555207333027841/photo/1
The photo is for the other fire:
"One fire was burning a structure on the 1800 block of Smith Ave. The two-alarm fire was originally reported at around 6:30 a.m."
That dead end street is industrial and has a couple of recyclers. It is also right in between the residence and the shooting scene. All three events were reported to 911 about the same time.
JMO I am highly suspicious of this other fire. I wonder if fire investigators will uncover explosives or timers at this location?