The Hunt for the New York Bomber

As more explosives discovered, the race is on to identify suspects.
2:51 | 09/19/16

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Transcript for The Hunt for the New York Bomber
Now to those bombs in New York City at least five people as you said taken into custody for questioning overnight. As authorities search for whoever planted the devices in Manhattan and New Jersey ABC's chief investigative correspondent Brian Ross is here with new developments corners Brian. Well good morning Robin even would those five taken into custody the search continues this morning for two other men considered the main suspects in this fast paced investigation. And the search could not be more urgent to make sure what happened over the weekend does not happen again. The upper third of this new surveillance video shows the moment of the blast the smoke billowing out. The impact seen here from inside the lobby of a fitness club. Yeah yeah caller had a home. Pedestrians fled the scene as police moved it. Then just four blocks away what this morning now appears to have been a major break in the case. After a tip from a local resident police discovered a second unexploded device. Build authorities say just like the one that did go off up pressure cooker with wires and a cell phone attached. I walk right by here and there's a pot on the street with wires sticking out of his. And think it is probably a kid's science experiments. The bomb squad used a robot to remove the device so they could examine it for fingerprints DNA and importantly the registration number of the self. Right now that seven as for us could be coop crucial tort case. Today police and federal agents will be tracking all calls made through the cell phone towers near the blast site off the cell tower. You can you can get information as to who called. And two you know may be calling each other there are so it could be very very important also important efforts today to collect. Additional videos from the dozens of surveillance cameras in place on the spot. Agents already have been studying the videos of residents walking calmly just before the blast. And then running for their lives afterwards. On the chance the bomber might be among them. Authorities tell ABC news one video in their possession shows a man leaving an object near the dumpster which was the seat of the first west then that same man is seen at the side of the second bomb. It was intentional. It was a violent act it was certainly a criminal act. I was a bombing. Officials say they are also investigating whether that bombing ten hours earlier Saturday at a Marine Corps charity race in New Jersey has any connections or similarities to the New York attack. The New Jersey bomb hidden in a garbage didn't was also triggered by a flip phone but he was constructed with lead pipes not a pressure cooker. I'm Brian what more can you tell us about the man that authorities are searching for in the five that are. Custody they are looking for one specific individual the five people taken into custody overnight were believed to be family members who are being followed. As they exit of the Verrazano Bridge. Authorities became concerned they might be heading to Kennedy Airport perhaps leave the country they pull them over and now question but they're still looking for that one suspect who is at large. Stories moving.

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

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