Here is a collection of articles and books to use when you are trying to help a child when the news all around them is quite scary and uncertain.
Helping Children with Tragic Events in the News
Talking to Kids About Current Events
Helping School-Age Children with Traumatic Grief: Tips for Caregivers
What to Do When the News Scares You: A Kid's Guide to Understanding Current Events
How to talk to children about difficult news
A few articles I have written that can be applicable: