OSLO - Hackers demanded ransom money from Norsk Hydro to stop an ongoing cyber attack on its IT systems, public broadcaster NRK reported on its website, citing a message sent by the Norwegian National Centre for Cybersecurity.

The Norwegian National Security Authority, of which the Norwegian National Centre for Cybersecurity is a part, was not immediately available for comment.

Norsk Hydro was not immediately available for comment.

(Reporting by Gwladys Fouche and Nerijus Adomaitis, editing by Terje Solsvik) ((gwladys.fouche@tr.com; +47 23 31 65 94; Reuters Messaging: gwladys.fouche.reuters.com@reuters.net; Twitter handle: @gfouche))