Our hearts are with you - I am so deeply sorry we were unable to stop this travesty.
We are covering your classes, do not worry about the school at this point. I can't come, myself, until classes are over, but I'm sending house-elves with provisions.
No arguments, Severus! I know you dislike the invasion of privacy in general, but it is very possible you will have an influx of sympathetic visitors over the next few days. Let me at least help ensure the basic details of meals and household chores are attended to.
Please assume that the aid of house-elves and your fellow colleagues is completely at your disposal for any assistance you may need in making memorial arrangements.
I am so very sorry. I will come as soon as I can. Three house-elves should be there very shortly - perhaps even before you read this, in which case I hope Severus does not hex them...
My deepest sympathy,
~Minerva