Here's a Snopes article addressing that. No overall conclusion. They found that a Border Patrol officer who raced to the school with a shotgun, grabbed 2 police officers, and evacuated another wing of the school. He got his own daughter but many other kids as well.
Two questions.
Did the Police Officers on site have any children attending the school?
Where any of the classrooms evacuated?
Here's a Snopes article addressing that. No overall conclusion. They found that a Border Patrol officer who raced to the school with a shotgun, grabbed 2 police officers, and evacuated another wing of the school. He got his own daughter but many other kids as well.
https://www.snopes.com/fact-check/officers-rescued-own-children-texas/