Potential extremist ties: Authorities are investigating whether the shooter was motivated by right-wing extremism, a senior law enforcement source said.

Police also found multiple weapons in his car.

The gunman's weapons: The shooter was armed with an AR-15 style rifle and had at least one other weapon on him when he was gunned down by police, a senior law enforcement source told CNN.

He used to work as a security guard and had received firearms training in that role, according to an official database. Garcia had been living in some kind of temporary housing in the Dallas area, the source said.

The shooter's background: The gunman, who dressed in tactical gear, has been identified as 33-year-old Mauricio Garcia, a senior law enforcement source told CNN.

The officer followed the sound of gunshots, tracked down the shooter and killed him, according to the chief.

Police killed the gunman: An officer was already at the mall for an unrelated call when the gunfire broke out, the Allen police chief said Saturday.

A father who rushed to be with his son at the mall described the horror that awaited him there. Victims ranged in age from 5 to 61 years old, according to a Dallas-area medical group.

More than a dozen victims: At least eight people were killed and seven more were wounded in the massacre, local officials said.

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