ALLEN, Texas − Authorities are looking into whether the gunman who killed eight people at a suburban Dallas outdoor mall showed an interest in white supremacist and neo-Nazi views, and if those provided a motive for the weekend attack, The Associated Press and CNN reported Sunday.

While cautioning that the investigation has just begun, law enforcement sources told the outlets that Mauricio Garcia and links to that ideology include social media accounts and posts as well as a patch on his chest that read “RWDS,” an acronym for the phrase “Right Wing Death Squad,” which is popular among right-wing extremists and white supremacy groups.

Garcia, 33, was killed by police responding to Saturday’s assault, which left seven people with injuries that required hospitalization.

In addition to reviewing Garcia’s electronic media presence, federal agents have interviewed family members and associates of Garcia to ask about his ideological beliefs and are reviewing his financial records said an official, who spoke to the AP on condition of anonymity.

Authorities were picking through shattered glass and shell casings Sunday at the mall in Allen, a city of 105,000 residents about 25 miles north of Dallas. Amid the chaos as hundreds of shoppers at Allen Premium Outlets scrambled for cover Saturday, a police officer on an unrelated call heard the gunshots and raced to the scene, Allen Police Chief Brian Harvey said.

“He heard gunshots, located the gunshots, located the shooter, neutralized the shooter, neutralized the threat,” Harvey said at a briefing late Saturday.

Three law enforcement officials who requested anonymity to discuss details of an ongoing investigation identified the shooter as Garcia, AP reported. One of the officials said Garcia had been staying at a nearby motel. The official said investigators have been searching the motel and a home in the Dallas area connected to the suspect.

US averaging a mass killing every week

Mass killings are happening with staggering frequency in the United States this year: an average of about one a week, according to an analysis of The Associated Press/USA TODAY/Northeastern University mass killing database. So far there have been 22 mass killings in the U.S. in 2023.

The Gun Violence Archive says the Texas mass shooting is the 200th in the nation this year and the 12th in May. Mass shootings, defined as four or more people shot, differ from mass killings, defined as four or more people killed.

Contributing: The Associated Press