Police at UMass Amherst are undergoing active shooter training. Dickinson Hall is being used because of its long hallways, many classrooms and multiple floors. Police are using fake ammunition rounds that sound like real bullets but just leave crayon marks. Active shooter training was developed in response to the 2007 Virginia Tech massacre.
Italy's highest court has overturned the murder conviction against Amanda Knox, bringing to a definitive end the high-profile case.
Six world powers and Iran move closer to a deal, but there are still major disagreements.
A look at some of the week's biggest headlines and the stories you may have missed.
Celebrities call for an Indiana boycott after the passing of a controversial law that could lead to discrimination against gay couples.