Soldiers from a Colorado unit accused in nearly a dozen slayings since returning home - including a couple gunned down as they put up a garage sale sign - could be showing a hostility fueled by intense combat in Iraq, where the troops suffered heavy losses and told of witnessing war crimes, the military said Wednesday.

The Army launched an investigation after soldiers from the 4th Brigade Combat Team, 4th Infantry Division - nicknamed the Lethal Warriors - were accused in a spate of five killings around Colorado Springs, home to Fort Carson, in 2007 and 2008.
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