"I don't believe you're going to find any biological relationship between the (shooter) and the victims, " Blair County District Attorney Richard Consiglio said, adding the three victims "were not immediate family" of one another.
Infra-red (IR) camera monitors currently used by firefighters require lenses that can be blinded by intense fire, said researcher Pietro Ferraro, of the Consiglio Nazionale delle Ricerche (CNR) Istituto Nazionale di Ottica in Italy.