You watch the TV, it illuminates a bright blue light that makes it stand out from the room, it slowly fades onto a risk alert and speaks in a robotic voice

"Emergency broadcast. Please listen to the instructions given carefully: The rate of alternate sightings have raised, please attempt to isolate yourself from others as much as possible. Keep firearms in a safe but accessible area incase of intruders. If you encounter an alternative, call the police immediately and do not interact with the alternate."