One of the world’s biggest wind turbine makers, Aarhus, Denmark-based Vestas Wind Systems A/S, shut down computer systems across several locations Saturday to deal with a cyber security incident.

Vestas discovered a cyber security incident Friday and has since then, together with external partners, worked to contain the situation and re-establish the integrity of its IT systems.

The company’s preliminary findings indicate the incident had an impact on parts of Vestas’ internal IT infrastructure and data has suffered compromise.

“As part of our crisis management setup for cyber security, we are working together with our internal and external partners to contain the issue fully and recover our systems,” the company said in a statement.

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Vestas said there are no signs that turbines being operated by its customers have suffered any kind of impact.

“At this stage, the work and investigation are still ongoing,” the company said in a statement. “However, there is no indication the incident has impacted third party operations, including customer and supply chain operations. Vestas’ manufacturing, construction and service teams have been able to continue operations, although several operational IT systems have been shut down as a precaution. Vestas has already initiated a gradual and controlled reopening of all IT systems.”

Vestas working to keep its stakeholders informed about the situation and will provide further updates when possible.