For extra precaution, quietly prop a sturdy chair or small piece of furniture against the door to serve as a barricade.
 Then, draw the blinds/curtains all the way., Take out a flashlight or use your cell phone to help you see if it is too dark in the room., If you must talk, whisper., Stay on the line with them as they will be able to provide updates on the situation and other guidance, as well as notify the authorities to help you should you need to defend yourself.
Immediately lock your door.
Close and lock any windows if they are open.
Turn off all lights.
Find somewhere to hide (in the closet, under the bed, etc) or sit quietly in a spot as far from the door as possible.
Call emergency services for further instructions.
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