DC Navy Yard Re-Opens as Questions Remain About Shooter

Aaron Alexis carved the words "better off this way" and "E-L-F Weapon" on the stock of his shotgun.
2:20 | 09/19/13

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Transcript for DC Navy Yard Re-Opens as Questions Remain About Shooter
-- watching America this morning. Now the latest on the navy yard shooting the navy launching an intense investigation into how warning signs about the suspected shooter were missed. An ABC news has learned new details about the deadly Rampage -- -- -- on revenues joining us this morning from the navy yard workers are returning for the first time -- morning -- Good morning Diana good morning John workers are back at the navy yard today security is tight. As for the killer Wheeler in the chilling message he left and -- done. The Washington navy yard reopens today but questions still remain about the shooter who killed twelve people. There were a lot of red flag. Why they didn't get picked up. Those -- all. Legitimate questions it. We're going to be dealing. Police in Rhode Island alerted the Newport naval station that -- Alexis told them a bizarre story about hearing voices and microwave machines keeping them up at night. But the navy says the information was never passed up the chain of command and Alexis kept his job as a civilian contractor with the navy. If someone is in a position where they have access. Two. Information and facilities because of their -- says among -- health issue -- problem. Can be extremely serious. ABC news has learned that a -- -- the words better off this way and my ELF weapon on the stock of his Remington 870 shotgun. Investigators are examining the meaning of the -- is Alexis his mother who asked not to be shown on camera apologize for her son's actions. -- incidence -- very sorry that this is happening in my heart is broken. Just a few blocks from the navy yard on Capitol Hill relatives of victims of previous mass shootings depleted for new gun legislation. I don't want another Stanley to go there when I'm going to right now we will not get up. We will not go away. We are here for -- rock. As a result of the shooting here the secretary of defense has ordered a review of military security and employee screening programs -- and. Right ABC's Tom Bradley live for us in Washington this morning thank you.

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

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