As the timeline of the Texas shooting comes to light with the 911 calls, there has been a growing debate on whether police made the “wrong decision” by failing to storm the primary school classroom where the gunman had barricaded himself.

Officers delayed entering because they did not believe it was still an “active shooter” situation, top safety official Steven McCraw said in a press conference Friday.

Students inside the school made multiple 911 call begging police to come inside and help them.

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McCraw confirmed there had been a 40-minute gap from the police unit’s arrival at Robb Elementary School to the moment they decided to storm the classroom.

The responding officer in charge decided to wait until the school janitor arrived with the keys because they thought that either “no kids were at risk” by then, or “no-one was living anymore.”

The delayed response has angered the public and several other politicians, calling for scrutiny into how the situation was handled.

On Friday, Texas Governor Greg Abbott said he was “livid” that he had been “misled” about certain information.

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“As everybody has learned, the information that I was given turned out in part to be inaccurate,” he said.

An officer for the school district, who was not on campus at the time, drove immediately to the scene following a 911 call. However, he “drove right by the suspect who was hunkered down behind a vehicle,” McCraw said.

By 11:35, the assailant had entered the school. Police officers followed him into the building minutes later but remained in the hallway. McCraw confirmed that as many as 19 police officers had gathered outside the classroom but no one entered.

It was not until 12:51 that a tactical unit entered the classroom and killed the 18-year-old gunman, who had already fatally shot 21 people.

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“With the benefit of hindsight where I’m sitting now, of course it was not the right decision. It was the wrong decision. There’s no excuse for that,” said McCraw.