Investigators Search for Clues in NYC, New Jersey and Minnesota Attacks

ABC News' Pierre Thomas and former NYPD Commissioner Ray Kelly analyze the investigation into the closely-timed attacks and any possible connections.
2:43 | 09/19/16

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Transcript for Investigators Search for Clues in NYC, New Jersey and Minnesota Attacks
Now let's turn ABC's senior justice correspondent Pierre Thomas and former NYP. NYPD commissioner Ray Kelly who's here in the studio with us we'll talk more about the investigation and here what are you hearing what is the current state. The investigation right now. Good morning Robin there's a growing belief that the bombings in seaside and Chelsea are connected it's not definitive yet but that's one of the working theories. This was sources are telling me. Are we in the bond utilized the phones to help them detonate. But there were some differences in design the seaside explosive device involved pipe bombs tied together the source tells me it was designed to detonate when the race began. But the two bombs in Chelsea on 23 in 27 streets. Have some of the signatures we've seen from bomb making designs posted online including in al-Qaeda is inspire magazine. Both Chelsea bombs in. Utilize Christmas flight for wiring and the pressure cooker bomb found intact have a label on it but the chemical cannot write. That's an explosive often used for target practice that can be picked up in me sporting good stores. That person took a bar on was to scrap them to me by a source as being extremely heavy. Containing shrapnel to Mac it's maximized injuries robbed and the way you describe those bombs like that that's really how you were able to determine who could be behind it. Absolutely and the sources are concerned that this could be the work of a serial Obama and possibly as sell some investigators believe it took more than one person to pull this off all right peer thing. And they're great Kelley here in re up uranium it NYPD for many years so what are you hearing about the police investigation. Well I think they getting and very close and and probably most significant element in this investigation. Was the unexploded cell phone on 27 straight a cell phone can give you. An awful lot of information every phone has a unique and number and I think that and that leads and emanated from the phone have been very very. Helpful so far. And we saw a little earlier than we are a thousand more police officers on the street on the ground to what are they looking for. On the ground. Yeah well they're looking for anything unusual obviously they'll be lots of calls today about suspected packages people will see more of them the police will respond to that. It's important remember that the NYPD is the biggest pleas from the country by 436000. Uniform officers the governor has added another thousand. Police office's national gotten so. It's going to be covered you know in in very significant fashion throughout the city but they're looking for anything untoward anything unusual where I have with the general assembly. The UN's ya also down at the big issue. That his department has an off lot of experience with this he may have as many as artisan thirty heads of state. Here in New York the but Soledad is off the shelf it's something it's done year of the year. Seek a service FBI everybody is involved in the game.

This transcript has been automatically generated and may not be 100% accurate.

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