The man suspected of killing 19 children and two teachers on Tuesday at Robb Elementary School in Uvalde, Texas, made several Facebook posts alluding to the shooting minutes before, according to the state's governor.

Around 30 minutes prior to arriving at the school, Salvador Ramos posted on Facebook that he was going to shoot his grandmother, Texas Gov. Greg Abbott said. In a subsequent post, he said he had shot his grandmother, and then in a third post, he warned he was going to shoot an elementary school, the governor continued.

"These kids will never attend school again," Abbott said in a press conference Wednesday. "Families are broken apart. Hearts are forever shattered. All Texans are grieving with the people of Uvalde."

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The gunman, identified as Ramos, had no known mental health history, and there was “no meaningful forewarning of this crime” besides the series of Facebook posts that began prior to his arrival at the school, the governor added.

Ramos shot his grandmother in the face before fleeing by vehicle, Abbott said. His grandmother was able to contact police after the shooting.

“The gunman fled and as he was fleeing had an accident just outside of the elementary school, and he ran into the school. Officers with the consolidated school district, they approached the gunman and engaged with the gunman at that time,” Abbott said.

Ramos entered the school through a back door, and once inside, he went down two "short" hallways before entering one classroom that was internally connected to a second classroom, officials said. Once inside, he began firing as both local and federal law enforcement "converged on that classroom," where Ramos was killed by a border patrol officer, Abbott detailed.

Ramos used one weapon, an AR-15-style rifle, in the shooting, Abbott added.

“We don’t see a motive or a catalyst right now,” said Steve McCraw, director of the Texas Department of Public Safety.

Wednesday's press conference was briefly interrupted as Texas gubernatorial candidate Beto O'Rourke confronted Abbott while he was onstage. The exchange was brief but tense as O'Rourke pressed the governor about gun laws in the state before being escorted away.

"There are family members whose hearts are broken. There’s no words that anybody shouting can come up here and do anything to heal these broken hearts," Abbott said.

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All 17 people injured in the shooting have non-life-threatening injuries. All family members of the victims have been contacted, Abbott said.