but the white house was deferring, waiting for the fbi to make that aunderstand noment. it became pretty obvious, i think when they went to the house and discovered the arsenal of munitions there, the -- the bomb-making equipment, that this wasn't just a workplace event, but now we have the official word from the fbi, and it's interesting to me that they really believed that the digital fingerprints may lead them to answer the big question, which is what is the motive. at one point, the fbi agent referred to it as possibly the golden nugget that would help understand the case. >> yes. >> reporter: and he mentioned the two cell phones had been crushed, but he also said they were still mining them for data, and that's one of the things the fbi is very good at is retrieving data from devices that have supposedly been disabled. he also mentioned that there had been efforts to erase their digital fingerprints. so right now that seems to be the most promising avenue of attack. the fbi did not go so far yet as to make the connection to isil overseas, and also said obviously tha