picture that still needs to be filled in by the investigation. >> he was arrested after shooting out the tires in a car that was parked outside his grandmother's house, arrested for shooting through the ceiling in his apartment building. but those didn't apparently set off any red flags in the security background checks and he was given clearance to enter this building. cnn's evan perez, thank you so much. appreciate it. >> thank you. >> so many questions surrounding what you just said. huge spotlight into security inside the navy yard. already some in congress are demanding answers. michael turner has actually sent a letter to the acting inspector general of the department of defense, demanding more information about the results of a navy security audit. he writes -- the congressman writes, it is my understanding that the ig reports indicates the navy may have implemented an unproven system in order to cut costs. i also learned that potentially numerous felons may have been able to gain restricted access to several military installations across the country