Investigators Race to Identify NYC Explosion Suspect

Authorities are trying to determine whether NY, NJ devices are linked.
2:17 | 09/18/16

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Transcript for Investigators Race to Identify NYC Explosion Suspect
All stories are calling the blast intentional investigators continue to pore over evidence from the crime scene as the hunt for the bomber or bombers continues. ABC chief investigative correspondent Brian Ross with the manhunt tonight. As authorities tonight on four Palmer on the lose. The most important clue could be the device that did not explode up pressure cooker connected to wires and a cellphone discovered four blocks from the first blast site in a white plastic day. Authorities believe it's similar to the device that did detonate. Apparently triggered in some manner by a cell phone the word is that both devices are pressure cookers that they were certainly similar in construct. The New York police bomb squad used a robot. To gingerly remove the unexploded device then taken to a lab to be examined for DNA fingerprints and significantly. The registration numbers of the cell phone will do so. Intelligently and move forward right now that's evidence for us could be coop crucial tort case. As technicians spent the day today marking each tiny piece of post blast debris on New York's 23 street. Officials said they had determined the explosive used in the bomb was a commercially available substance called kind of online videos offer instructions on how to make it then how to sentinel. Police in federal agents tonight are also doing a slow motion analysis of the surveillance video of the scene. To see whether the bomber could be among the pedestrians walking the sidewalks before the blast we want to see who was on a street prior. And after on the chance Obama used the chaos of the ball. And yeah. Old. Look he's got. Better chief investigative correspondent Brian Ross joins us now why are there any suspects at this hour. At this point no suspects are in custody at all Tom and there's been no claim of responsibility for many terror group. The pressure cookers had been used by terrorists around the world most recently the two bombs set off at the Boston Marathon three and a half years ago. Whoever was responsible for the attack here for whatever motivation. The so he was terrifying and terrorizing to the people of New York a lot of similarities the Boston Marathon bomb in Iraq Brian thank you so much.

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

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