On Wednesday, a woman going by the screen name fionashaytoon published a video on Instagram allegedly capturing audio of what was broadcast on the loud speakers during the moments after the latest Ft. Hood shooting in Texas. The message was simple but chilling.

“…doors and windows,” the video picks up as an automated female voice can be heard saying. “Shut off heating, ventilation and air conditioning. Seek shelter immediately.”

The video then cuts off:

The Instagram account includes several pictures of a woman and family that also feature a man in uniform, suggesting the account is linked to someone on base.