With grief there are no words, but there are some simple actions that help others in a time of distress. One of the best things people can do is be a quiet presence. A hug, a handhold, or an arm around a shoulder can bring a sense of calm to a chaotic soul. Also, you can pray (silently). Pray for the family, pray for God's comfort/peace, pray for their grief to be healthy. Words will not be remembered, but actions will. Love is the best sermon ever given. God is love and when we are love to those in grief, we become, through the Holy Spirit, the presence of God in a difficult time.
There will be a time later, when words are needed. When those that have grieved will need words of encouragement, words of wisdom, and maybe even explanation. However, in the midst of the heartache, fill the void with love, not words.
As for other atrocities that plague people like some listed above other actions are needed. But that is a blog for a different day. Today I mourn for these girls and their sweet mother and the whole family who have lost a loved one.