Authorities investigate Las Vegas shooting suspect's past

ABC News' Pierre Thomas reports on what officials want to know about Stephen Paddock, 64, the suspect in the shooting that left more than 50 dead.
1:46 | 10/02/17

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Transcript for Authorities investigate Las Vegas shooting suspect's past
We'll bring back Pierre Thomas. What new do you know? Again, they're looked in on Stephen paddock trying to get additional information about his background. So far no ties to international terrorism. Law enforcement telling me this is looking like crime and horrific mass shooting like we saw at sandy hook and the Virginia tech massacre. Trying to figure out how he got the weapons, what was the motive, were they converted into machine guns. Those are the critical question. Can you tell us how this investigation will play out from this point on? One of the first things they did was to look at all known data bases, federal data bases, looking at crime information, looking at terrorism information. In terms of terrorism nothing came up. So far no indications of any kind of significant criminal background for this man. That's all been done. Still more work to be done in terms of looking at surveillance photographs and video that may have been around the hotel. They'll search his home, search for smart phones, computers anything that will glean information about what the motive might have been. They were already able to dismiss the companion had any information. Right. They talked to her. Right now the early indication is she had no idea this was about to go down. They will begin to ask her additional questions about did he say anything that suggested he was planning to go something. Was he angry about anything? Anything she can provide. Any known associate family member will be contacted.

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

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