The gunman, identified as 18-year-old Salvador Ramos, also posted a message saying he was going to shoot his grandmother, as well as another one confirming that he had done so, Abbott said. His grandmother, whom Ramos shot in the face shortly before attacking the school, survived and called police.
Ramos fled the home he shared with his grandparents and crashed his car near Robb Elementary School in Uvalde, Texas. He entered the school through a backdoor carrying an assault-style rifle and wearing tactical gear.
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He barricaded himself in a fourth-grade classroom, authorities said, and killed students and teachers before he was fatally shot by a U.S. Border Patrol officer, Abbott said. A further 17 people suffered non-life-threatening injuries.
The Facebook posts were the only advance warning of the rampage, Abbott said, adding that Ramos did not appear to have any criminal record or history of mental health problems.
Ramos purchased two rifles and hundreds of rounds of ammunition days before the attack, several news outlets reported, citing a state senator who had been briefed by law enforcement.