Authorities search for motive in Las Vegas shooting

ABC News contributor Steve Gomez analyzes what investigators are focusing on in the aftermath of the shooting that killed 50, making it the deadliest shooting in modern U.S. history.
2:00 | 10/02/17

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Transcript for Authorities search for motive in Las Vegas shooting
feel safe. We're going to bring in former FBI agent Steve Gomez. It's very apparent, Steve, a lot of planning went into this. A lot of planning. He clearly reconed the Las Vegas area, knew there was a concert that was going to be held for three days. It was a festival. Arranged to have a room high up T. Civilians there were sitting duckings. It's so unfortunate. out is this kind of attack has years. After 9/11 this is what we thought was going to happen. Somebody not really related to ISIS or a foreign terrorist organization. It appears that way. It's a soft tarkt they were concerned with especially in Vegas. The concern seemed to be the casinos not an event like this Exactly knowing the casinos This wasn't a location expected penetrate that security. Just walk into the hotel with prevented? duffle bag in and most people are going to think you have your clothes or whatever going in there. In this situation he had a lot of guns. How are you going to stop this? It require it is help of the public. They have to be alert to anybody that has mental health issues or they're thinking about committing some sort of act even if they're just talking about it. You have to raise that to law enforcement so they can look into it. Steve, thank you. We'll go back to the white

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

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