Not a callous question at all. West isn’t too far from where I live. I’ve driven to and through it many times. The facts aren’t in, so I can’t say whether it was a bombing or simply a terrible accident. However, I suspect the latter. Fertilizer plants are notoriously dangerous. I think it’s easy to think it might have been a bombing because of Boston and what seems to be a flurry of related (though not) incidents, but probably not.