Firefighters work to extinguish a fire that started involving a large mound of recycling materials inside the Waste Management Recycling Center Processing Facility, 30869 Route 83 in Grayslake, Friday evening. | Photo: Craig / Captured News

A sprinkler system helped contain a fire that broke out in a large mound of recycling materials inside a Waste Management facility in Grayslake, fire officials said.

The Grayslake Fire Protection District responded around 11:30 p.m. Friday to the Waste Management Recycling Center Processing Facility, 30869 Route 83 in Grayslake.

Grayslake Fire Protection District Lt. Ian Mandigo said crews initially responded after receiving an activated fire alarm.

Firefighters arrived to find moderate smoke showing from the rear of the building.

Firefighters work to extinguish a fire that started involving a large mound of recycling materials inside the Waste Management Recycling Center Processing Facility, 30869 Route 83 in Grayslake, Friday evening. | Photo: Craig / Captured News

Mandigo said the incident was upgraded to a confirmed structure fire, bringing additional fire department crews to the scene.

Firefighters were quickly able to contain and extinguish the fire.

The fire was confined to a pile of recycled materials, Mandigo said.

No physical damage was done to the building itself due to the effectiveness of the automatic sprinkler system.

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Firefighters work to extinguish a fire that started involving a large mound of recycling materials inside the Waste Management Recycling Center Processing Facility, 30869 Route 83 in Grayslake, Friday evening. | Photo: Craig / Captured News

Employees arrived on the scene and removed the smoldering materials outside of the building using a front-end loader.

Fire crews overhauled the burnt materials once they were outside the building.

The cause of the fire is still under investigation, Mandigo said.

The Round Lake, Mundelein, Libertyville, Countryside and Gurnee fire departments assisted at the scene.

Grayslake fire stations were covered by the Lake Villa, Libertyville and Waukegan fire departments.