>> it was an epic debacle in united states law enforcement history. a deadly shootout followed by a 51-day siege that ended with more than 70 people dead in a raging inferno. all caught on live television with the whole world watching. two questions rise from the ashes of this american tragedy. who shot first and who started the fire? >> it began innocently enough. in 1935 a small religious group moved to waco. an offshoot of the seventh day adventist church, they eventually called themselves as the branch davidians. >> pretty stable leadership for a lot of years, and they were known in town as a somewhat bizarre but benign religious group that pretty much kept to themselves.