Documents examined by the Austin American-Statesman and KVUE-TV show armed police officers stood in a Uvalde elementary school hallway with at least one ballistic shield within 19 minutes of a gunman arriving at the school, where he killed 21 people, 19 of them children.

After the devastating elementary school shooting in Uvalde, Texas Tuesday morning, H-E-B announced a $50,000 donation to help the victims and their families.

At least 19 children and two adults were shot and killed in a mass shooting Tuesday at Robb Elementary School in Uvalde, officials said.

The United States is once again reeling from a shocking act of violence inside an elementary school — an institution where the most innocent are supposed to feel safe.