An Apple Store in Monterey, California was evacuated yesterday as employees began to fall ill reportedly due to a package delivered to the location covered with an unknown substance. CBS reports that “fire and hazmat officials determined the package was contaminated in transit when an unknown substance most likely leaked onto the package’s exterior.”

Employees at the store in the Del Monte Shopping Center called 911 at 12:25 p.m. after some employees began feeling dizzy and nauseous after handling a package that was delivered to the store, according to Monterey Fire Chief Gaudenz Panholzer… Firefighters and the Monterey County regional hazardous materials team evacuated three stores, including the Apple store, as well as an outdoor eating area, according to Panholzer.

Officials later told The Monterey Herald that the substance was likely organic peroxide, often used as a disinfectant, and reportedly leaked onto the package at a FedEx distribution center before going out for delivery.

Monterey Herald said four people were taken to hospital, most of whom were Apple employees, but there was no information on their status.

The images above and below come from Twitter users on the scene (via BI) and more images and video below via @VFisher45: