her name is karen leigh. tells us that she was on a conference call for work when she heard a loud boom. >> glass was flying out of the window. the front door was busted. i was so worried, you know, about the blast coming through. >> reporter: karen tells us that their own sustained significant damage. her window, her door, her garage just completely ruined. she says the important thing is that her and her husband are okay. she says she doesn't know if anyone was home next-door at the time. san francisco fire chief ginny nicholson couldn't tell us of the person who was injured was a person who 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,