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An ordinance expert and trainee told me looking at the available photos of the scene show a lack of soot on the lawns, relatively little amount of shrapnel. a tree knocked down with the foliage intact. after viewing these things, you know, what -- do you still stand by with a high degree of confidence there was a significant explosion and not something like a gas tank explosion or something like that that may misdirect a secondary explosion? >> we know there was a secondary explosion. assessed what was there was going to be used in a high profile attack. i don't have details on the information...

Me that the photos of the scene show a look of soot on the walls, so relatively little shrapnel. so after viewing these things, what is your feeling, do you think it was a significant explosion and not something like a gas tank explosion or something like that they may have been there and what would be used in a high profile attack. i don't have details on the investigation that you're talking about there. but we will continue to assess

E.o.d. tech from the publicly available photos of scene show a lack of soot on the the walls, relatively little amount of shrapnel, there is a tree that was knocked down that was -- with the foilage still in act. so after viewing these things, do you still stand by with a high degree of confidence there was a significant explosion and not something like a gas tank explosion or something like that that may misdirect the evidence of a big secondary explosion? >> we know that, as i said earlier there was a secondary explosion. that assessed that what was there was going to be used in a high profi...

The mother of three wasn't surprised. she, her son and two grandchildren had asthma too so gordon began researching the health impacts of pollution. >> every workshop, congress, symposium i attended. >> she found black soot inside her home. >> in my mucus lining and throat. >> reporter: she began to connect the dots. >> we have so much pollution. we have three freeways that surround a black community. we have the ships, the trains and the trucks 24/7. thank you very much. >> reporter: she co-founded the west oakland environmental indicators project. teaming up with scientists who set up truck ...

Questions they asked you, how they treated? you >> they asked me about catherine's whereabouts, if they she had anywhere friends at the time, who would be in the house, and utilities in the house that would've had a problem, things like that. >> the interview was routine, but the investigation was not. firefighters cannot figure out what ignited the blaze. they check the wiring, the appliances, the pilot stove, the propane tanks, nothing conclusive. but then, things changed. the da brought in a specialist, a forensic pathologists to do a second autopsy a few days later. and the results this ti...