Details Emerge About Attacker in Nice

Mohamed Lahouaiej Bouhlel identified as driver who killed 84 during holiday celebration.
2:01 | 07/15/16

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Transcript for Details Emerge About Attacker in Nice
Next here to the man who so ruthlessly. Struck those crowds of people including those families with children ABC's chief investigative correspondent Brian Ross tonight on the man. Who was behind the wheel. Desperate for leads French police took the killers estranged wife into custody today. Upsetting her neighbors who said she had not lived with him for two or three years. Police also searched the apartment of Mohammed who now in this working class neighborhood of lease looking for any clues about what led to the deadly attack. Molly hunter of ABC news is on the scene yeah and that he might without. Right. Yeah. Born in Tunisia but a longtime resident of France the 31 year old Mohammed lisle a delivery man had criminal convictions for theft and assault. But even as French authorities called the attack an act of terrorism. They also acknowledge who Lal was not known to counter terror officials not on any terrorist suspect list. As of tonight there have been no claims of responsibility for vices or any other terror group. As long as the other but prices has repeatedly urged his followers to attack westerners in any way possible. Including inviting them over with cars counterterrorism officials have to be concerned about this tactic. Using a truck as a weapon they had this level. He's Doughty. At least 400 people have now died and ice is inspired or directed attacks against the west. From Paris and other French cities to Brussels. Do instant book to send Bernadie two or land. Carried out without warning and and a temple that is counter terror officials have not been able to stop. Its list of the taxes really overwhelming Brian but a French authorities say this attack in niece was not on their radar at all that's right David amend completely unknown to counterterrorism official. Using a simple unsuited to get a weapon. Even US officials say that kind of attack has almost impossible to stop Brian thanks to you.

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

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