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Explosives experts try to determine what exactly happened to roberto. >> a piece of metal. that piece of metal said to him that there was something more going on. that's why we redesigned humira. we wanted to make the experience better for you. now there's less pain immediately following injection. we've reduced the size of the needle and removed the citrate buffers. and it has the same effectiveness you know and trust. humira citrate-free is here. a little change can make a big difference. humira can lower your ability to fight infections. serious and sometimes fatal infections, including tub...

Robert was -- told paul that he was going to get my share of what my dad was going to leave me of the ranch. >> reporter: fair to say though that your nerves were a little bit raw about ed and robert. >> oh, no. i was mad. i'm going to be honest with you. there was a lot of animosity. >> reporter: so much so that one day pete jumped into his truck and drove down to the farm and called roberto out. >> i told him, well let's go. >> reporter: your intention was to fight him. oh, yeah. it settles things. >> reporter: but roberto politely declined. he had a farm to run. the next time pete heard any...

That. coming up -- along with the crops, growing resentments at the farm. >> robert told paul that he was going to get my share of what my dad was going to leave me of the ranch. >> your intention was to fight it? >> oh, yeah. it settles things. >> the investigation continues as explosives experts try to determine what exactly happened to roberto. >> he came across a piece of met metal, that piece of metal said to him there was something more going on. >> the first clue unearthed. when "dateline" continues when "dateline" continue ♪ wingardium levitoga ♪ wingardium leviosa ♪ thanks. th...

Rifles drawn. and i just could not believe what i was witnessing. >> again, that witness trying to get to the location, living just one block away from the scene at the tree of life synagogue. joining me now, nbc news justice correspondent pete williams. what's the latest. >> one of the things that was resolved by the public safety director in a news conference a short time ago was there were no comes to found inside. there had been reports that suspicious packages had been found and there could be explosive bombs inside. explosives experts checked those out and found no evidence of that. appa...

Them? we'll ask two explosives experts next.