Authorities say at least 10 people were killed, including a city police officer, after an armed man with a rifle, opened fire in a supermarket parking lot on Monday afternoon. LEARN MORE: Boulder shooting: 10 killed, including police officer Eric Talley; suspect charged: https://abcn.ws/317ihBu Senate lawmakers debate how to curb gun violence in wake mass shootings: https://abcn.ws/3cg67wG #Boulder #BoulderMassacre #EricTalley #GMA