Norwegian aluminum producer Norsk Hydro was hit by a cyberttack which began Monday evening and escalated into the night.

The Norwegian National Security Authority (NSM) declined to comment on what type of attack it was but said the extent of the attack is still being assessed and that it’s too early to state how big it was.

“We are helping Norsk Hydro with the handling of the situation, and sharing this information with other sectors in Norway and with our international partners,” a spokeswoman for the agency told Reuters.

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