sfax into so much more understory tonight at the root insider. and another hour of your news is coming straight ahead. they have removed. and what they says did not spark the deadly fire. and a massive water main break in the heart of san francisco. we'll have a progress report on the repairs. kron 4 news at six is next. >> reporter: in additional help to aid in determining the cause of the ghost ship warehouse fire good evening everyone, i'm steve aveson. and i'm catherine heenan. it was last friday night when fire engulfed that oakland warehouse, killing 36 people fire investigators say many of them were trapped on the second floor. tonight additional atf agents are on scene. kron 4's dan kerman is live in oakland to explain why. there's been a lot of focus on building inspections after the ghost ship fire. today a fire marshal with the contra costa county fire district talked about the process.saying there are no real requirements when an owner is not actively seeking a permit. bob marshall the bottom line is there are only a few things mandat