san francisco fire chief ginny nicholson couldn't tell us of the person who was injured was a person is inside the home who has now collapsed. but she said she hasn't seen anything like this in a long time. >> the last time that i was at a call like this was in the late 90s on 19th avenue when i home exploded. >> reporter: we can see the cars that are parked lined up in front of the home also sustaining damage. you can see some of the windows shattered. things have fallen on it as well. we also saw debris on the road, and again, shattered glass on the road. this road has been blocked off, especially after this initially happened. at one point we are told there were about 1900 firefighters and medical personnel. the fire chief said that this is going to be a long investigation. of course we are going to stay on top of it. >> jocelyn, thank you. lots of you pull out your cell phones to take video. this is from the citizen app. many of you reported an explosion in the sunset. you can see the black smoke visible for miles. i saw it on the golden gate this morning. some footage was taken