‘Forgive me, forgive my son’: parents of Texas school shooter respond

Ominous social media posts could have alerted the authorities but sifting through possible threats is an enormous task, experts say

The mother of the 18-year-old gunman who shot dead 19 young children and two teachers and wounded many others in an elementary school in the small town of Uvalde, Texas, this week has said: Forgive me, forgive my son."

Adriana Martinez looked distraught as she wept in her car, telling CNN affiliate Televisa, in Spanish: I have no words to say, I don't know what he was thinking."