that same de angn was used to set f the boston marathon bombs and investigators are looking at available somewhere else from a nontsirorist source. u.s. officials are also looking at his orsea travel. twice to saudi arabia where he said he met his wife and to pakistan where she's from. >> so, we don't know whether th is workplace rage or something larger or ae combination of both. >> reporter: they also say the attackfuwere planned in advance. ey found 4500 rounds of ammunition and pipe bombs in the dlands house. and the suv was a rental picked up three or four days ago. >>e- there's nothing impulsive ul boit this about this shooting at all. >> reporter: so with all that fire power, did they have other attacks in mind? >> we n't know yet the extent of their plans. >> nbc's pete williams reporting for us. let's go back to rockefell center. shiba is there. and in terms of what's happening in san bernardino county, we're acrossthe street from the irc and that's can indication as days go forward, they're moving forward withe their investigation. >> more signs of progress. thank you. politica