In light of recent news which I had hoped would not come to pass, I would encourage all of you to return to Hogwarts Castle at once for your own safety. I know that leaving your families in such a time is a difficult decision, but my concern must be for your own well-being.
The Hogwarts Express will be making daily trips from Kings Cross Station to Hogsmeade village and will be well-guarded. I strongly encourage you to return as soon as you are able.
Headmistress Minerva McGonagall
(Added to the note for all muggleborn students.)
Do not come by the train, and do not reveal your receipt of these to anyone. Attached is a portkey that will activate to bring you directly to the Great Hall when it is held in your hand and you speak the Hogwarts Motto clearly.
I would strongly suggest that you return to the castle at once.
I will need volunteers to guard the Hogwarts Express daily as it brings students back to the safety of Hogwarts.