I discovered this site while looking to confirm that Fred Rogers' mother really did say what I'd seen posted on Facebook. She did. She was speaking to a young Fred when he was worried about some event in the world. Fred Rogers tells it this way: "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."
I hope this helps your child.
For ways to help children deal with grief, see: http://jsbrookspresents.blogspot.com/2010/01/helping-child-deal-with-grief-and-loss.html
To help deal with your own grief, please see: http://jsbrookspresents.blogspot.com/2012/11/in-grief-you-truly-learn-where-you-stand.html