the trajectory eddie that claimed the life of 17 students and teach heer teachers, peterson's ibarra barraction coming into focus. tipster saying cruz was going to explode describing him as a violent child who posted about firearms and isis and worries about him getting to a school and shooting the place up. >> we keep hearing every day about something new that was missed or something new that should have been done based on information that was reported to law enforcement. >> this was just one of dozen of concerned flagged to the authorities. >> since 2008 the broward shiffr sheriff's office was involved in 23 calls involving he or his brother. >> according to the sheriff the calls are still under review. >> yeah there was a fight in my house. a kid, and my son punching him. that's why he left the house i need someone here because i'm afraid he will come back, he has a lot of weapons and he put the gun to his brother head before it's not the first time. >> abc news obtained recordings of the fright evaniening 911 ca the family who had taken in cruz after his mother died. >> he is going to