To help your children deal with distressing images on the news you may wish to look at:
http://www.childrenandmedia.org.au/

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OR

http://www.childrennow.org/index.php/learn/talking_with_kids//television/twk-news.html Tips for talking about tough issues
http://aacap.org/page.ww?name=Children+and+The+News&section=Facts+for+Families (an American site with useful tips)