. >> reporter: textron aviation, the parent company of beechcraft and cessna, says it builds prototype planes in the building where this blast occurred, and some items can be highly explosive. the cause of the blast is under investigation. the company said there were fewer workers on site due to the holiday. tom? >> thank you. >>> and survivors describing the terrifying moment their plane began to vibrate and shattered as it was going down. here's ian pannell. >> reporter: the plane was departing >> the plane started vibrating intensely. >> reporter: it hit a concrete fence and a two-story building. the rear of the plane in the field next to the airport. there were nearly 100 onboard. 12 killed, almost 50 in hospital. eight in critical condition. miraculo miraculously, many survived, including this baby. plucked from the wreckage by a policeman. >> she's my sweetheart. i was thinking about her when i went in the plane, yes. what would she do without me? >> reporter: investigators want to look at the age and condition of the plane, as well as pilot performance. given how cold it was, th