NBC News identified the suspect as Patrick Crusius of Allen, Texas, citing unspecified police sources.
A Twitter account bearing the suspect’s name contains liked tweets that include a “BuildTheWall” hashtag, a photo using guns to spell out “Trump,” and posts from Paul Joseph Watson, a far-right Youtuber who works with Alex Jones at InfoWars.
Authorities are examining a four-page document that several media outlets are calling a manifesto. Authorities are trying to determine the document’s authenticity and whether there are ties to the suspect.
The document mentions the suspect in the Christchurch, New Zealand mass shooting at two mosques that left 51 people dead in March. The suspect in that shooting has pleaded not guilty.
The manifesto allegedly linked to the El Paso shooting suspect contains white nationalist talking points on “ethnic displacement" and "race mixing" and refers to immigrants to the United States as "invaders."