(CNN) The shooting rampage at an Oregon community college occurred in the most heavily armed nation in the world, a society with a firearm for nearly 90% of its 321 million citizens.

The gunman who shot and killed nine people and injured nine others at Umpqua Community College in Roseburg on Thursday had 14 firearms, according to the Bureau of Alcohol, Tobacco, Firearms and Explosives. They were all purchased legally by the shooter or a member of his family in the past three years, officials said.

Five pistols and a rifle were found at the college, where the shooter died after a firefight with police. It's unclear whether police shot the gunman or he turned a weapon on himself. In the killer's apartment, authorities other weapons, including three pistols, four rifles and a shotgun.

After the massacre, a visibly shaken President Barack Obama told the nation, "There is a gun for roughly every man, woman and child in America. So how can you, with a straight face, make the argument that more guns will make us safer?"

As the nation mourns the victims of another mass shooting, the raw numbers of gun violence paint a chilling picture of America's intimate relationship with firearms.