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Three women embrace near Nationals Park where family members waited to greet loved ones that were at the Washington Navy Yard, Monday Sept. 16, 2013, in Washington. At least one gunman launched an attack inside the Washington Navy Yard, spraying gunfire on office workers in the cafeteria and in the hallways at the heavily secured military installation in the heart of the nation's capital, authorities said. (AP Photo/Alex Brandon)

WBEN Extra: Shootings At DC Navy Yard

An employee at a defense contractor used his pass to get into the Washington Navy Yard and went on a deadly shooting rampage Monday, spraying bullets in the hallways and firing from a balcony on workers in an atrium below. Twelve people were killed plus the gunman.

36 Photos Shootings at the Washington Navy Yard
VIDEO: Alleged Navy Yard shooter targeted victims from high angle

Video  Why did Navy Yard gunman open fire?

The motive for the attack — the deadliest mass shooting on a military installation in the U.S. since the tragedy at Fort Hood, Texas, in 2009 — was a mystery, investigators said.

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Mayor Vincent Gray said there was no indication it was a terrorist attack, but he added that the possibility had not been ruled out.

The assault at the highly secure Navy Yard unfolded about 8:20 a.m. in the heart of the nation's capital, less than four miles from the White House and two miles from the Capitol.

AP PhotoThe gunman, Aaron Alexis, a 34-year-old former Navy reservist whose last known address was in Fort Worth, Texas, died after a running gunbattle inside the building with police, investigators said.

A law enforcement official told CBS News' Pat Milton the shooter was discovered with an AR-15 assault rifle and a shotgun with him and was wearing dark blue clothing.

Milton reports that the shotgun was traced to a gun store in Lorton, Va., according to a federal law enforcement official. The official said the shotgun was purchased at the store within the last week.

CBS News correspondent Bob Orr reports that Alexis was also found with a sidearm that authorities believe may have come from one of the Navy Yard's security officers.

For much of the day, authorities said they were looking for a possible second attacker who may have been disguised in an olive-drab military-style uniform.

But by late Monday night, they said they were convinced the attack was the work of a lone gunman, and the security lockdown around the area was eased.

"We do now feel comfortable that we have the single and sole person responsible for the loss of life inside the base today," Washington Police Chief Cathy Lanier said.

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Topics : Law_Crime
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Locations : Fort WorthLortonTexasVirginia
People : Aaron AlexisBob OrrCathy LanierPat MiltonVincent Gray
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