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Norwegian gas flows via the Zeepipe pipeline dropped to zero after around 0800 GMT from a rate of over 40 million cubic metres (mcm) per day earlier.
By 1015 GMT flows to Belgium were running at a rate of 14 mcm/day. Belgian gas grid operator Fluxys said the drop occurred due to problems on the Norwegian side.
Gassco confirmed the drop, but did not provide details.