The Texas School Shooter Shot His Grandma First & 'Barricaded' Himself In With A Class

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The gunman who killed more than 20 people at a Texas elementary school bought two assault-style rifles shortly after his 18th birthday and teased the shooting on social media beforehand, authorities say.

The shooter walked into Robb Elementary School in Uvalde, Texas, on Tuesday and started shooting, killing 19 children and two adults while also injuring 17 others. He later died in an exchange with police.

Authorities have since identified him as Salvador Ramos, an 18-year-old who hinted at the massacre days before it happened.

"He suggested the kids should watch out," state Sen. Roland Gutierrez told reporters.

The shooter legally purchased two assault-style rifles and ammunition earlier this month, Texas state Sen. John Whitmire told CNN.

Ramos also posted photos of the rifles on his Instagram before the shooting, The New York Times and others report.

Texas Gov. Greg Abbott said Ramos shot his grandmother, then drove to the school and crashed into a nearby ditch before he went inside to "horrifically, incomprehensibly" carry out the shooting.

Police were already on the scene when he went into the school.

"As soon as he made entry into the school he started shooting children, teachers, whoever's in his way. He was shooting everybody," said Lt. Christopher Olivarez of the Texas Department of Public Safety, per the New York Post.

The shooter then "barricaded" himself in one classroom with children and two teachers, Olivarez told NBC News.

"Just goes to show you the complete evil from this shooter," Olivarez told CNN.

He added that Ramos went to a local high school.

"He lived with his grandparents, was unemployed, no friends, no girlfriend that we can identify at this time, no criminal history, no gang affiliation as well," Olivarez said.

Authorities say Ramos' grandmother was rushed to hospital in critical condition but was still alive as of Wednesday morning.

A GoFundMe campaign for the victims has already raised more than half a million dollars to date.