Authorities are investigating whether the Allen, Texas, outlet mall shooter was motivated by right-wing extremism, a senior law enforcement source familiar with the investigation tells CNN.
While the investigation remains ongoing and authorities have not zeroed in on a specific motive, the source said the deceased shooter was found with an insignia on his clothing that read "RWDS," which authorities believe may stand for "Right Wing Death Squad."
As the Southern Poverty Law Center, an organization that monitors and reports on extremism, has noted in the past, some members of extremist groups have been seen in recent years with patches bearing the same letters.
Investigators have also uncovered the gunman's extensive social media presence, the law enforcement source tells CNN. It includes neo-Nazi and White supremacist-related posts, and images that authorities believe he shared online, according to the official.