Three students who said they knew the teenager accused of carrying out a deadly school shooting in South Florida this week claim they previously reported him to school administrators, BuzzFeed reported on Saturday.

According to BuzzFeed, the three students — Dana Craig, 16; Matthew Rosario, 16; and Enea Sabadini, 17 — said they reported Nikolas Cruz, 19, to school administrators after he displayed erratic and threatening behavior. 

Three other students who asked for their names not to be used due to privacy concerns confirmed their accounts to BuzzFeed, according to the report.

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Craig, Rosario and Sabadini all reported receiving threats from Cruz. They also said that Cruz got into a fight with Sabadini after he began dating Cruz’s ex-girlfriend, according to BuzzFeed.

Craig told BuzzFeed that she had been leery of Cruz, because “he had guns and weapons and we all knew about it.” After Cruz got into a fight with Sabadini, Craig, Rosario and another witness reported it to administrators, according to the report.

“I remember when the fight happened, I went and I said, ‘I know that he’s brought weapons to school. You need to take his bag, you need to check it,’ ” Craig told BuzzFeed. 

The revelation that administrators at the school were warned about erratic behavior by Cruz came a day after the FBI acknowledged that it failed to follow its own protocol after it received a tip in January from someone close to Cruz warning about the teenager’s gun ownership, erratic behavior and desire to kill.

That caller also voiced concern that Cruz could potentially carry out a school shooting, according to the FBI. That warning, the agency said, “should have been assessed as a potential threat to life.” The FBI never investigated that tip, nor did it pass the complaint on to its Miami field office.

Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, an attack that left 17 people dead and more than a dozen others injured. He was charged this week with 17 counts of premeditated murder and has confessed to the shooting.

In the hours and days after the attack, former classmates’ and friends’ accounts of Cruz, along with reported social media postings have depicted an image of the suspect as a disturbed teenager with an obsession with guns and violence.