Las Vegas police frustrated in trying to find motive in shooting massacre

Officials investigating Stephen Paddock have yet to find a reason why the 64-year-old opened fire on a country music festival nearly a week ago.
2:42 | 10/07/17

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Transcript for Las Vegas police frustrated in trying to find motive in shooting massacre
We want to turn to the latest in the Las Vegas mass shooting investigation. Police are extremely frustrated trying to figure out Stephen paddock's motive. Authorities are learning more about the methodical way he planned the massacre. ABC's Kenneth Moton is in las Vegas with more. Kenneth, good morning. Reporter: Good morning, Jon and Paula. Just an incredible memorial behind me here. This community rightly wants to focus on the victims but this morning they're still a lot of attention on the gunman police investigating every aspect of his life from birth to death. This morning a hunt for a motive is growing increase will goly frustrating. We thought we might find some political or social reason, some medical reason. We haven't found it yet. Reporter: Electronic billboards up and investigators are asking more tips about Stephen paddock. Is it possible the motive is he did it because he could? Certainly a possibilityut it's one of those possibilities that you really can't wrap your mind around, can you? I don't know if I could accept that one. Reporter: New details ee merging. Sources say he kept a low profile to avoid suspicion from hotel security. On the phone with room service authorities say he pretended he was speaking with others in the room checking their orders, so hotel staff wouldn't think he was alone in the large suite. His final days authorities say included a prostitute and a gambling spree. Near his killer's perch they found a recent prescription for valium and a note with a series of cryptic numbers. Keep your head round. Reporter: Nearly a week since he opened fire on thousands of people at a music festival. I've been shot in the arm. You've been shot? I need 911. I need an ambulance. Reporter: New video and incredible stories of survival. People rushed to help 48-year-old Doug Carter separated from his wife and son. Here, stay right here. He's been shot. It's just amazing there was someone there to help my dad and -- I was worried. I thought he was on the street somewhere. Reporter: Police are credit creditling Jesus campos. He was shot while responding to a door alarm on that 32nd floor. He rose to the occasion and acted like an absolute hero. Reporter: An attorney for paddock's girlfriend Marilou Danley says she continues to cooperate with the FBI. Just days after president trump made a visit to Las Vegas, vice president pence will be here today to attend and speak at a unity prayer walk. Jon and Paula. That motive still so bizarre. They have pies to the puzzle but don't fit right now. Kenneth, thank you for your reporting.

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

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