You keep fireplace ashes inside your home

Christmas day fire kills 7 year old twins, a 9 year old and the grandparents.  (Associated Press story).  The mother said she was concerned about the bag of ashes that her boyfriend placed on a plastic bin in the mud room.  She dismissed her worry because she saw her boyfriend run his hand through the ashes.  Ashes in a paper bag, on a plastic bin, both highly flammable.
When I bought my house in January of this year I went to a hardware store to buy a metal bucket with a lid to put my fireplace ashes in.  The clerk stated that even though the bucket is made of metal, ashes can burn right through the bucket so always immediately put it outside in a safe place.
Running your hands through ashes does not guarantee that you'll come in contact with the few remaining hot ashes.  Even with a metal bucket I never cleaned out the fireplace until the next day and sometimes several days if I had a fire that burned most of the night.