Three days later it is still smoldering and some spots. Federal agents with the bureau of alcohol, tobacco and firearms returned to help with the investigation on the cause of the fire. They brought the mobile command unit and they have set up here with the open Fire Department in the slot lot across the street. Atf investigators are meeting with the oakland firefighters and police. I spoke briefly with one of these agents offcamera said the National Response team comes to help investigate when there is a big fire like this. They have not determined the cause of the fire and they have not had chance to into the building to investigate because they are not sure whether it is safe enough to do so. The challenge for those that live and work in the area, yesterday more than a dozen glass panels from the Office Building near the fire started shattering and falling to the ground below. It was due to the radiant heat from the fire, sending the windows and two days later when the windows began