DENVER - President Barack Obama used a campaign stop in Colorado on Wednesday to call for an end to "senseless violence" across the country, appealing to Americans to focus on ways to stop it.

Referring to the shootings at a movie theater in Colorado and at a Sikh temple in Wisconsin in recent weeks, as well as last year's shooting of former congresswoman Gabrielle Giffords and others in Arizona, Obama stopped short of calling for gun control but said concerted action was needed.

"We've got to put an end to this kind of senseless violence, whether it's in Aurora, whether it's in Oak Creek, whether it's in Tucson, whether it's in cities all across America where too many lives are cut short," he said in Denver.

"As one American family, we're going to have to come together and look at all the approaches that we can take to try to bring an end to it."

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