(NewsNation) — The families of 19 of the victims in the Uvalde elementary school shooting in Texas announced a $500 million federal lawsuit against nearly 100 state police officers who were part of the law enforcement response that day.

Ven Johnson, the attorney representing the families impacted by the 2021 Oxford school shooting in Michigan, joined “NewsNation Now” to discuss the Uvalde lawsuit, which was filed Wednesday.

“Full and complete accountability of anyone and everyone where the mistakes were made that could have prevented injury and death — all of us should be on the same page,” he said. “That’s what we all want.”

A 600-page Justice Department report released in January catalogued “cascading failures” in training, communication, leadership and technology problems that day.

The gunman in the 2022 shooting at Robb Elementary School in Uvalde, Texas, killed 19 students and two teachers in a fourth-grade classroom. Heavily armed officers waited more than hour to confront and kill the 18-year-old gunman.

The lawsuit alleges state troopers didn’t follow their active shooter training or confront the shooter, even as the students and teachers inside were following lockdown protocols.

“You had 370 different responding officers — federal, state and local — and you had 70 minutes … before (officers) went in to confront the shooter in the room where they knew he was the entire time,” Johnson said. “My heart breaks for these families.”

The Associated Press contributed to this report.