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When the story of the Aurora shooting broke last week those of you outside the U.S. told us the reason behind the tragedy was American gun laws.

Ethan in Kenya: "The right to bear arms should be repealed!"

But David in Connecticut tweeted: "This was a result of his environment. The rest of us aren't killing anyone - so why him?"

Today we hear that in the three days after the shooting, applications for the background checks needed to buy a gun legally in Colorado were up 43% on the previous week.

We hear from people in the U.S. who own guns answer some of the criticisms from the rest of the world...