Residents in Lancaster, Pennsylvania, were under a shelter-in-place order for half a mile early Sunday after a hazardous materials leak was reported near a meat company, officials said.

The incident involved anhydrous ammonia at the Kunzler Meat Company, located at 652 Manor Street, the HazMat 2 Environmental Fire Rescue Company said.

Anhydrous ammonia is stored as a liquid under pressure but becomes a toxic gas when released, according to health officials.

Neighbors reported smelling an odor near the company building around 7:30 a.m., FOX43 in York reported.

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No injuries were reported.

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Officials warned residents to stay indoors while HazMat teams set up devices to take air samples throughout the area.

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No further details were immediately available.