Navy Yard reopens after mass shooting

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The Washington Navy Yard is open for business again three days after a gunman killed twelve people.

Most workers are returning with questions about how the shooter got in and whether gun control laws could have made a difference.

Workers returned to the Navy Yard Thursday morning.

"Their spirits are high and they are looking forward to getting back to a routine," said Captain Monte Ulmer, Commanding Officer.

Everything is reopening except the gym, where the FBI is set up, and building 197. That's where authorities say Aaron Alexis used a shotgun etched with the words: "BETTER OFF THIS WAY" and "MY ELF WEAPON."

The Veterans Administration says it treated Alexis for insomnia, but never for mental illness.

His reports of paranoia never made it up the chain.

"What shoulda been done that wasn't done, should have been more done," said Chuck Hagel, Secretary of Defense.

Alexis' mother apologized to families whose loved ones were killed.

"I don't know why he did what he did and I will never be able to ask him why," said Cathleen Alexis.

The shooting has Capitol Hill talking gun control again. There's a huge rally planned on Thursday.

"I don't want another 15-year-old to be having to pick out his sister's casket," said Carlos Soto, Victoria Soto's brother.

"There's no reason to believe that any kind of background check would have stopped this tragedy," said John Malcolm of The Heritage Foundation.

The Navy denies that a Pentagon report citing money issues with its security clearance program made the Navy Yard any less safe.

"We don't cut budgetary corners for security," said Admiral Jonathan Greenert, Chief of Naval Operations.

A review of all Navy security should be finished in two weeks.