According to reports, the Robb Elementary School shooter, Salvador Rolando Ramos went on a murderous spree after apparently arguing with his grandmother about his failure to graduate from his Texas high school.

According to a neighbour of Salvador Ramos, the 18-year-old got into a heated argument with his grandmother, Celia Martinez Gonzales, whom he gunned down before entering Robb Elementary School in Uvalde on Tuesday morning. 

Ramos barricaded himself inside a classroom and opened fire, killing 19 children — at least five of whom were fourth-graders — and two teachers who were trying to protect them.

He lived with his grandparents near the school where he allegedly carried out the atrocious massacre. His motivations are unknown.

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Ramos was disappointed that he would not be able to graduate from Uvalde High School, as per Eduardo Trinidad (the neighbour).

Newsy reporter John Mone revealed – “He got into an argument with the grandmother and she was screaming. He shot me! He shot me!’ and then he got in the car, zoomed down the street, there was some kind of crash, according to Mr Trinidad. The suspect got out, he had two weapons, and then started engaging in gunfire,” he added.

Trinidad later told The Washington Post that he did not explicitly overhear the quarrel.

Trinidad went to Gonzales’ (neighbour) house after hearing a ruckus on Tuesday, where other neighbours told him about the heated argument, he said.

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Gonzales was in a serious condition, according to Sgt. Erick Estrada of the Texas Department of Public Safety, who spoke to CNN late Tuesday.

The shooting on Tuesday was the deadliest school shooting in US history since the Sandy Hook Elementary School massacre in 2012, which killed 20 children and six adults.

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According to hospital officials, another 15 children and four adults were injured in the mass shooting. 

Texas passed the “Second Amendment Sanctuary State Act” as part of House Bill 2622, which prohibits state and local governments from enforcing federal gun laws, thereby shielding the state from the federal government’s gun control efforts.