NYC Suspect Bought Bomb Parts Months Ago

New purported details on plot revealed in criminal complaint.
2:30 | 09/21/16

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Transcript for NYC Suspect Bought Bomb Parts Months Ago
The latest on suspected bomber Ahmad were humming. Officially charged with using weapons of mass destruction here in new York and New Jersey as new details about the attack and his wife. Emerge ABC's chief investigative correspondent Brian Ross is here with those details good morning Brian. Well good morning Robin the new federal charges play out in detail how were humming assemble the components built the bombs and planned event in four locations alleging he was motivated by calls from. Overseas jihadist leaders to attack non believers wherever they live. Officials say the planning for the fateful day he would plant the bombs allegedly hidden in roller suitcases began at least three months ago. It's as fingerprints and forensic evidence tie him directly to the bomb that went off the New York. The bomb that failed to detonate four blocks away. Plus the bomb placed in a Marine Corps charity race in New Jersey. And at a New Jersey train station well. And the complaint also describes to a broad comedies favorite videos on YouTube as G Heidi anthems including this wouldn't mountain. The charges come the day after Ross on these father told reporters he had warned the FBI two years ago. That his son had developed connections to terrorists and and what you. You tell them. But the FBI says the father later recanted his allegations and the sun was never questioned by the FBI. If I always part of the investigation of that point. I would ask why are we not doing a the father's allegations followed his son's yearlong trip to Pakistan which is now a key to the investigation officials today are reviewing photos posted on FaceBook of the accused bomber Wally in Pakistan raw how many also married and had two children with this woman. Osce a BB. Who entered the US at Kennedy Airport in May 2014. And then left the US three months ago in June. Around the very time officials say her husband began to build his bombs this morning officials confirm Rahal and his wife was interviewed by the FBI Tuesday. After she was stopped at the Dubai airport attempting to board a flight to the US. The FBI is looking to talk to other relatives as well in the complaint officials say were humming is recorded on a family members cellphone. Doing a kind of test run in the friendly backyard. Just days before the actual bombing. The complaint does not identify which famine never may have recorded. This issue there aren't Brian thank you very much.

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

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