Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past

ABC News' Tahman Bradley says investigators are checking into how Alexis kept his security clearance
2:36 | 09/18/13

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Transcript for Aaron Alexis: New Questions Into the DC Navy Yard Shooter's Past
America this morning. This Wednesday with new questions about the background of navy yard -- Aaron Alexis investigators are focusing on how Alexis managed to keep his security clearance even though he was clearly trouble. Now the navy -- -- a review of how it checks the backgrounds of contract workers with more on this -- -- joined by ABC's tomorrow I'm Bradley. The navy yard good morning tomorrow. John and Diana good morning to you both the navy yard. Here is closed again today except for essential personnel some of those workers came back yesterday under heavier security. As for the investigation we're learning stunning information about warning signs that -- -- Law enforcement authorities tell ABC news the Washington navy yard shooter -- and Alexis. Was a ticking time bomb on a final descent into madness but it appears no one connected the dots. On August 7 Alexis called the Newport police in Rhode Island with a bizarre tale documented in a police report obtained by ABC. He described a confrontation. With the unidentified person. Who sent three people to follow -- and keep them awake. By talking to -- sending vibrations to his body through a microwave machine sources tell ABC news Alexis recently sought help from VA hospitals in Rhode Island in DC for insomnia. But officials won't discuss his mental state. Now I can't come on come out on the -- just -- -- for the navy yard Rampage Alexis visited a gun store and firing range in Lorton Virginia. Eyewitnesses to the shooting are describing a determined killer John Weaver watched the suspect methodically murders six of his friends. I pop my head up. And I saw him pointing his gun. At my friend. He shot her. The day after the shooting Washington pause to remember the twelve he. People who -- one of those victims 52 year old Richard Michael original a veteran of the Iraq War. He loved the ravens. -- -- -- -- -- -- President Obama told -- Mundo that the US is more vulnerable to these types of mass shootings. Because the country does not have a strong enough background check system on gun purchases. John and -- turning to -- on Ratliff live in Washington for us this morning thank you.

This transcript has been automatically generated and may not be 100% accurate.

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