Investigators search El Paso shooter's home for motive

Eyewitnesses noted Patrick Crusius calmly walked towards Walmart before unleashing gunfire on his victims; police apprehended the shooter on-site without incident, never firing their weapons.
1:35 | 08/04/19

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Transcript for Investigators search El Paso shooter's home for motive
Police say they're already looking into capital murder charges against the alleged gunman. ABC's Kyra Phillips is in Washington with that part of the story and what we're learning about the suspect. Kyra, good morning. Reporter: Good morning, whit. Witnesses described the gunman as walking towards the Walmart calmly and confidently as if on a mission. Now investigators are working to determine, as you know, what motivation was driving that mission. It's unclear if he's cooperating with law enforcement right now but authorities say that the interview process is still ongoing and that they're searching his house and social media history for answers. As you've heard earlier, sources are telling us that his goal was to, quote, shoot as many Mexicans as possible. So the possibility, whit, that this massacre was racially motivated certainly is a leading theory for investigators right now. And Kyra, you're learning more about reports of a document linked to the killer that expressed anti-immigrant views. Reporter: Right. And the El Paso police chief is saying that investigators are looking into what he is calling a manifesto, and it's believed to have been written by the shooter, whit, saying that it shows a possible nexus to a hate crime. That document expressing fear that white voters in the U.S. Will be replaced by hispanics. The FBI is currently reviewing evidence right now to determine whether this massacre can actually be classified as a hate crime or domestic terror attack and whether to move forward with federal charges. Kyra Phillips for us in Washington, thank you.

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

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