Mother of the 18-year-old who gunned down 19 children and two teachers at a Texas elementary school has said, "My son wasn't a violent person," according to BBC.

"My son wasn't a violent person. I'm surprised by what he did," Adriana Reyes told the Daily Mail from the hospital where her own mother is being treated for a gunshot wound to her face, BBC said.

The mother, however, denied that she had a "toxic relationship" with her son.

Adriana Reyes. Photo taken from Instagram

"I had a good relationship with him. He kept to himself; he didn't have many friends," she said.

Reyes also told NBC News: "I'm very upset about everything. A lot of stuff has happened, but right now I don't feel good."

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Reyes' boyfriend, Juan Alvarez, told NBC that "I never got along with him. I never socialised with him. He doesn't talk to nobody."

"When you try to talk to him he'd just sit there and walk away," he said.