"Hispanics will take control of the local and state government of my beloved Texas, changing policy to better suit their needs," the manifesto said.

The case was classified as a state murder investigation. Authorities were looking at potentially bringing capital murder charges against Crusius.

El Paso is on the US-Mexico border, across from Ciudad Juarez, Mexico. The El Paso del Norte Port of Entry is among the busiest US border crossings. Since last year, a large number of migrants from Central America have been arriving at the border to seek asylum in the US.

Marcelo Ebrard, Mexico's secretary of foreign affairs, said six Mexican nationals were among the injured, according to the Times report.