Riyadh, Nov. 15 -- Saudi Arabia's National Early Warning Platform issued a potential danger alert in Riyadh City on Sunday, November 15, urging residents to take shelter and follow official safety instructions.

The alert instructed residents to remain calm and move immediately to the nearest safe location, preferably inside a building or an interior room away from windows. They were told to stay indoors until the threat had passed.

Those outdoors were advised to enter the nearest building or seek shelter behind a solid barrier. Motorists receiving the warning were told to pull over away from bridges and high-rise buildings.

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Authorities also cautioned against approaching dangerous locations, gathering in affected areas or film...