Federal authorities said they're treating Saturday’s mass shooting in El Paso, Texas, as a domestic terrorism case and weighing hate crime charges, but the suspect is unlikely to be charged as a terrorist because there isn't an actual "domestic terrorism" law on the books, experts told ABC News.

"We’re gonna conduct a methodical and careful investigation with a view towards those charges. We are also treating this as a domestic terrorist case," John Bash, U.S. Attorney for the Western District of Texas said on Sunday. "It appears to be designed to intimidate a civilian population to say the least. We are treating it as a domestic terrorism case, and we're going to do what we do [to] the terrorists in this country, which is deliver swift and certain justice."

Read more: ABC News