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Authorities say 18-year-old Salvador Ramos, armed with an AR-15 style weapon, stormed into a classroom, barricaded himself inside, and opened fire.
Nineteen children lost their lives inside that classroom along with two teachers.
MORE: What we know about Texas elementary school shooting victims so far
For responding officers, this was personal. Many had their own children in harm’s way.
“To all EMS units, standby. Do not attempt to get closer. We got shots fired,” a radio broadcasted to rescue workers.
Officials say officers shot and killed the suspect roughly 40 minutes to an hour after his first encounter with a school resource officer at the building’s entrance.
Authorities say the suspect turned 18 just nine days ago.
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The ATF said just one day after his birthday, Ramos bought an AR-15 style rifle.
Three days later, he bought a second one.
And four days later, he was at Robb Elementary School.
Ramos’ grandfather told ABC’s Matt Gutman he didn’t know his grandson had weapons.
“If I would have known, I would have reported it,” Rolando Reyes said.
Messages obtained by ABC News also reveal a chilling warning just minutes before the shooting.
The suspected gunman texted a 15-year-old girl in Germany.
First, he described an argument with his grandmother over paying his phone bill.
Later, he wrote, “Ima go shoot up a elementary school right now.”
Investigators are now pouring over his social media.
The school superintendent ended the school year early.
SEE ALSO: US sees sharp rise in deadly mass shootings
Dr. Hal Harrell, Superintendent at UCISD said, “My heart was broken today. We’re a small community and we will need your prayers to get us through this.”
A Customs and Border Protection official told ABC News that there were four border patrol agents, members of elite specialized units, who engaged and stopped the shooter along with the state and local officers.
TAKE ACTION: Resources for survivors and victims of gun violence
The number of people injured or killed does not include the suspect or perpetrator. These graphics show the number of victims across all mass shootings since 20 children and six adults were shot and killed at Sandy Hook Elementary School in Connecticut on Dec. 14, 2012.
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