Criticism of the police response in the Texas elementary school shooting that killed 21 people continued to build Sunday, with a Texas state senator who represents Uvalde saying mistakes by officers may have led to more deaths.

Recounting a conversation he had with a mother whose daughter died from a single gunshot in an interview on CNN’s “State of the Union,” Democratic state Sen. Roland Gutierrez told host Dana Bash that “these mistakes may have led to the passing away of these children as well.”

“The first responder that they eventually talked to said that their child likely bled out,” Gutierrez said. “In that span of 30 or 40 minutes extra, that little girl might have lived. That little girl might have lived.”

The law enforcement response to the shooting Tuesday, which left 19 students and two teachers dead, has been under fierce scrutiny after it was revealed that officers — after facing an initial barrage of gunfire — were on the scene for more than an hour before engaging the shooter. Officials have said local police waited outside the classroom and did not expeditiously make an attempt to breach it, as is procedure.

The gunman was ultimately killed by a Border Patrol tactical team that engaged him. Gutierrez further questioned the lack of clarity on the timeline of which law enforcement agency was in charge of the response.

“I have asked [the Texas Department of Public Safety] at what point each one of their officers arrived,” he said. “At what point does the local police take operational control, or should they? At what point does the next superior power, DPS, take operational control or should they? And lastly, the federal government, they waited some as well. At what point should they not have taken operational control?”

Gutierrez said he told the head of DPS that he didn’t think it was fair to place the sole blame on the school district’s police. “At the end of the day, everybody failed here,” Gutierrez said. “We failed these children.”