The suspect behind Saturday’s deadly shooting in El Paso, Texas, reportedly devised a manifesto explaining his race-based motives for the attack.

The shooting took place at a Walmart in the late morning. Texas Gov. Greg Abbott announced in the evening that 20 people were killed, and police said 26 others were injured and have been taken to local hospitals for treatment. Police detained a suspect they said was a 21-year-old white man from Allen, Texas, a suburb of Dallas. Although police have not confirmed the exact identity of the suspect, a law enforcement source in El Paso told the Washington Examiner that Patrick Crusius is the name of the individual taken into custody.