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To be a detonator. facebook, soon, cut off his live stream and law enforcement surged in. setting up a wide perimeter and evacuating several nearby buildings, including the supreme court and a house office building. roseberry communicated with police at first using a dry erase board. at one point writing, don't shoot me. police, eventually, sent in a robot with a phone to communicate more clearly but he never used it. surrendering, instead. >> right now, we have no indication that he was acting with -- with anyone -- anyone else. but that, again, is part of the ongoing investigation. >> report...

At one point writing, don't shoot me. police, eventually, sent in a robot with a phone to communicate more clearly but he never used it. surrendering, instead. >> right now, we have no indication that he was acting with -- with anyone -- anyone else. but that, again, is part of the ongoing investigation. >> reporter: capitol police said, later, they found possible bomb-making materials inside the truck. but not a working bomb. the standoff marked the third major security incident on capitol hill this year. following the deadly january-6th insurrection and a good friday incident in which a man ...

>> that's an excellent point. you have been very focused that these bombs didn't detonate or there's some evidence that is out there that he didn't intend for them to detonate where they weren't even intended as destructive devices. however, the fbi has said that these devices were capable of exploding. with a distinction in terms of them blowing up or not it is important is that these devices were sent according to their theory and term of his trying to intimidate the recipients. so the issue here isn't necessarily an all of these counts whether or not this was an act of a bomb or a working b...

Contract. >> so let me just ask you, do you think they have more of these bombs that are ready, that are built? >> erin, you and i could go out tonight, get the equipment and if we had explosives it would be very easy. we could have a bomb by tomorrow morning, a working bomb tested, the circuitry and the rest of it. it's very easy, the technology is widespread through the middle east. you know, we were picking up in the '70s and '80s and so forth. they've only gotten more sophisticated. you can take the detonators the size of an eraser on the pencil. very hard to detect. >> the video from isis...

Isis-inspired attack on a beach in florida. harlem suarez, a 23-year-old from key west was arrested monday after he received what he thought, according to authorities, was a working bomb but was actually a phony device provided by the fbi. nbc news justice correspondent pete williams joins us with the latest on this investigation. pete, what more can you tell us? >> tamron we've got this and some developments in new york. first the florida case the fbi said this man came to the attention after posting some violent odd voluntaryadvocate ing advocating entry on facebook. he told the fbi that he ...