2 destructive fires in San Francisco were both accidents

SAN FRANCISCO (KGO) -- ABC7 News has learned the cause of two destructive fires in San Francisco were both accidental.

A fire in January killed one person at a Mission Street apartment building, displacing 40 others.

Investigators say the fire began in a wall but don't know what ignited the flames.

And a second fire that burned two homes in Potrero Hill last Christmas was electrical. It caused six million dollars in damage.