ELK GROVE, Sacramento County (CBS) – Restaurants in the Sacramento area are falling prey to a messy and expensive prank.

Two restaurants in the Elk Grove area recently received prank calls that led workers to activate the emergency fire suppression systems in their kitchens, CBS Sacramento reported.

Someone is calling the restaurants, identifying themselves as a representative of the alarm company and telling workers that the workers need to test their fire suppression systems, according to the Cosumnes Fire Department.

The caller reassures the workers that the systems are in test mode, and when the workers do what they’ve been told, are met with a big, messy surprise. Suppression systems spray a combination of wet and dry chemicals onto cooking surfaces like grills and deep fryers.

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