Two Democratic lawmakers introduced an amendment to ban ammunition sales online in Congress, so far the only new proposal on gun control in the United States.

[Carolyn] McCarthy of New York introduced the bill in the context of the political repercussions of the recent massacre at a theater in Colorado.

[Frank] Lautenberg and McCarthy suggest that the trade of military supplies via online stores should be supervised by federal authorities and purchases regulated at a minimum amount below current levels allowed.

Aurora police said that James Holmes, charged with the slaughter in the Century 16 movie theater, purchased more than 6,000 bullets on an unidentified digital site. Twelve people were killed and 58 wounded in the July 20 shooting.

On Monday, Holmes was formally charged with 24 counts of first-degree murder and under the laws of Colorado (center) could face the death penalty by lethal injection.

The administration of President Barack Obama already rejected the submission of a new law on arms control despite the social and media impact of the recent fatal incidents in several cities of the country.

The White House confirmed in a statement that it does not intend to evaluate any legislation that jeopardizes citizens' right to buy, carry and use arms, certified in the Second Amendment of the U.S. Constitution.

The federal administration spokesman, Jay Carney, said Obama's argument on this is the same as stated in March 2011, when six people were killed in a public shooting six people in Arizona and Congresswoman Gabrielle Giffords was wounded.

Political analysts commented that the real reason for inaction is that, four months before general elections, the executive will not want to upset the powerful National Rifle Association, with millions of fans from coast to coast.