The worst mass shooting in U.S. history has sparked a renewed debate about gun control laws in the country.

James Holmes, a 24 year old student at the University of Colorado Medical School was detained Friday following the shooting of 70 people inside a movie theater in Aurora, Colo. Twelve people were killed in the attack, which was carried out with an assault rifle, a shotgun and a pair of  Glock pistols at the midnight screening of “The Dark Knight Rises.”

Not much is yet known about Holmes, but investigations into the weapons he owns show that he purchased them legally. He purchased the four guns at local shops, and bought more than 6,000 rounds of ammunition on the Internet in the past 60 days, Aurora Police Chief Dan Oates said.

“All the ammunition he possessed, he possessed legally, all the weapons he possessed, he possessed legally, all the clips he possessed, he possessed legally,” Oates said. As far as investigators know now, Holmes had a clean background, with the exception of a single traffic ticket.

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