This page from the Fred Rogers Company, which details how to talk with your kids about terrible events in the news, is making the rounds on Twitter. If you have kids, it's an important resource.
"When I was a boy and I would see scary things in the news, my mother would say to me, "Look for the helpers. You will always find people who are helping." To this day, especially in times of "disaster," I remember my mother's words and I am always comforted by realizing that there are still so many helpers – so many caring people in this world."