Disturbing, Alarming or Very Terrifying: Three scenarios for Trump's presidency

Police Still Searching for Leads After Boston Marathon Bombing

Hagel calls bombing a 'cruel act of terror'; Boston-area apartment focus of investigation, but no suspects are yet in custody; Massachusetts governor says no additional bombs found on scene.

U.S. President Barack Obama on Tuesday called the bombings that killed three andwounded more than 170 people at the Boston Marathon a day earlier an...