The FBI missed at least one warning and countless warning signs in the months before Nikolas Cruz opened fire on Wednesday and killed 17 students at Marjory Stoneman Douglas High School in just minutes.
The first came back in September when they were alerted to comment made by YouTube user 'Nikolas Cruz' proclaiming his desire to be a 'professional school shooter.'
At the same time he was posting photos to his public social media account which showed off an arsenal of weapons, including multiple semi-automatic guns.
And he had not only joined the white nationalist group Republic of Florida but also begun participating in paramilitary training exercises with the organization.
All this, along with the fact that he had know mental health struggles and three school expulsions, was not enough to land Cruz on the FBI's radar.