Very tragic indeed..the mother must be such a wreck now with sadness and guilt. Probably must have been one of those careless split second decisions that many of us moms might be guilty of sometime in life.
The thing that gave me goosebumps is that my daughter reminded me, when I related to her this story, that a long time back, when we were at the airport, she had joked with me about sitting on the conveyor belt! Thank God she never wen't ahead and did it, but this made me realize how something so deadly can occur even a place you might least expect it.