The commander at the scene of a shooting at an elementary school in Uvalde, Texas, was not informed of panicked 911 calls coming from students trapped inside the building as the massacre unfolded, a Texas state senator said Thursday.

Sen. Roland Gutierrez said the pleas for help from people inside Robb Elementary School on May 24 did not make their way to school district police Chief Pete Arredondo. The Democratic senator called it a “system failure” that calls were going to the city police but were not communicated to Arredondo.

“I want to know specifically who was receiving the 911 calls,” Gutierrez said during a news conference, adding that no single person or entity was fully to blame for the massacre.

However, he said, Gov. Greg Abbot should accept much of the responsibility for the failures in the police response.

“There was error at every level, including the legislative level. Greg Abbott has plenty of blame in all of this,” Gutierrez said.

Nineteen children and two teachers died in the attack at Robb Elementary School, the deadliest school shooting in nearly a decade. Seventeen more were injured. Funerals for those slain began this week.

The gunman, 18-year-old Salvador Ramos, spent roughly 80 minutes inside the school, and more than an hour passed from when the first officers followed him into the building and when he was killed by law enforcement.

Since the shooting, law enforcement and state officials have struggled to present an accurate timeline and details of the event and how police responded, sometimes providing conflicting information or withdrawing some statements hours later. State police have said some accounts were preliminary and may change as more witnesses are interviewed.

Much of the focus turned to Arredondo. Steven McCraw, head of the Texas Department of Public Safety, said Arredondo believed the situation had turned into hostage situation and made the “wrong decision” to not order officers to attempt to breach the classroom as 911 calls were being made to the outside.

Gutierrez said it’s unclear if any details from the 911 calls were being shared with law enforcement officers from multiple agencies on the scene.

“Uvalde PD was the one receiving the 911 calls for 45 minutes while officers were sitting in a hallway, while 19 officers were sitting in a hallway for 45 minutes” Gutierrez said. “We don’t know if it was being communicated to those people or not.”

But, the senator said, the Commission on State Emergency Communications told him school district police chief did not know.

“He’s the incident commander. He did not receive [the] 911 calls,” Gutierrez said.

Uvalde Police Chief Daniel Rodriguez has not responded to a phone message from The Associated Press seeking comment Thursday.

Police communications were also a problem in 2019 when a gunman shot and killed seven people and wounded more than two dozen during a shooting rampage in Odessa, Texas.

Authorities said at the time that 36-year-old Seth Aaron Ator called 911 before and after the shootings but a failure in communication between agencies — they were not all operating on the same radio channel — slowed the response. Ator was able to cover some 10 miles before officers shot and killed him.