How nationalist thinking leads to violence

A 21-year-old white man has been charged with capital murder in Saturday's shooting spree. Police in El Paso cited a racist, anti-immigrant manifesto posted online shortly before the shooting, which they attributed to the suspect, Patrick Crusius.

The four-page statement was posted on 8chan, an online message board often used by extremists, and believed to have been authored by the suspect. It called the Walmart attack "a response to the Hispanic invasion of Texas." It also expressed for support for the gunman who killed 51 people at two mosques in Christchurch, New Zealand, in March.