Orlando Shooter's Wife Under the Microscope

Investigators are questioning Omar Mateen's wife to determine her knowledge before the attack.
2:24 | 06/15/16

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Transcript for Orlando Shooter's Wife Under the Microscope
more in the next half hour. But that other unimaginable story out of very same city in Orlando now talking about the gunman's wife. She is now under the microscope in that terror investigation. They are grilling her about what she may have known ahead of the shooting and questions this morning now about whether she will face charges. ABC's Pierre Thomas has the very latest also from Orlando. Good morning to you, Pierre. Reporter: Good morning, Amy. Today the killer's wife fines H herself in the crosshairs of a sweeping FBI investigation. What did she know and when did she know it? The focus of the FBI probe whether Noor Salman had direct knowledge her husband was planning mass murder. They just spoke to her. I will leave it at that ant don't want to talk about anything. Reporter: Salman apparently cooperating finally agreeing to answer questions after investigators showed her among other things closed circuit TV footage of her and husband at various locations in Orlando. FBI agents are trying to determine if they were scouting possible targets. After she started answering questions, agents gave her a polygraph test. Law enforcement sources say that prior to the attack, Noor Salman allegedly went with her husband to buy ammo and recently had gone to the pulse nightclub with him at least once. ABC news has learned Salman allegedly suggested to the FBI she tried to talk her husband out of harming anyone but it's unclear whether she knew or believed an attack was immine. Overnight the FBI went to Salman's mother's home. Apparently to ask more questions. The FBI is now dissecting her life, Monday the 30-year-old was seen at the home she shared with her husband and their 3-year-old son. She was super sweet. Super sweet and a fantastic mother. Reporter: But was she hiding something? How much did Noor Salman know about her husband's radical beliefs? He had been under intensive FBI investigation and under surveillance for ten months. The owner of the gun that sold him the gun suggested he was frustrated noven of this information was available to him. Would you have liked to have known the FBI was investigating him. For terrorism, it would be fantastic. He wouldn't have gotten the gun. Reporter: If the killer's wife did know about this horrific plot before it took place sources say she likely will face charges. They want to send a clear message, if someone knows someone is planning a massacre, you must turn them in, period. George. No question about that. Pierre Thomas, thanks very much.

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

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