hopefully, through the electronics and through the girlfriend, they're going to find out exactly what that is, or what his motive was. >> reporter: a key question remains. were there any accomplices in las vegas with stephen paddock? they continue to investigate whether anyone might have known about this attack before it occurred, that they're examining voluminous amounts of videotape, including some from the mandalay bay hotel and that so far, they have not located anyone else who they believe might be a suspect. brian todd, cnn, las vegas. the explosive found in the shooter's car can be purchased legally in the united states. cnn's wolf blitzer spoke earlier with a top las vegas police official and asked him what the gunman was planning with it. >> he purchased legally that tannerite. i believe he also had those two precursor chemicals as we discussed earlier, the ammonium nig nitrate and the chloride. it's a binary explosive, tannerite is, you take the two