This is the 21-year-old gunman authorities say walked into an El Paso, Texas Walmart and slaughtered at least 20 people with an AK-47-style assault rifle.

The suspect was identified by authorities as Patrick Crusius, 21, of Allen,  ABC News reported.

He was “taken into custody without incident” El Paso Police Department Sgt. Robert Gomez said.  His motive was not immediately known, Gomez said.

A surveillance still released by KTSM 9 News shows the alleged shooter looking to his left as he walks through the automatic doors with his weapon pointed ahead.

The man is dressed in cargo pants and a black T-shirt, and appears to be wearing yellow-tinted tactical glasses and shooting earmuffs.