Firefighters were to the US Silica production plant in Ottawa, IL Monday morning after a blaze ignited in a machine, several local news organizations reported.

Crews from Ottawa and Naplate responded to the facility after the blaze ignited around 3 a.m., radio station WCMY said. The fire started in a machine in the sixth story of a sand processing building.

A ladder was used to access the fire, Naplate Fire Chief John Nevins told broadcaster WLPO. No injuries were logged. The official described the incident to the station as “minor.”

US Silica’s location in Ottawa is the biggest silica production site in North America, according to the company. It has an annual capacity of 2.2 million tn/yr of silica.