Nearly 8% of Norwegian offshore oil and gas workers plan to strike from ​June 5 if state-brokered wage mediation fails, labour union data ‌showed on Monday.

The three unions involved have around 8,100 members involved in oil production.

Of those, 617 would take part in an initial wave of strikes ​if talks break down, with the option to escalate ​action over time.

It was not immediately clear whether a strike ⁠would impact Norway’s petroleum output.

The workers, organised by unions Styrke, ​Lederne and Safe, are seeking pay rises above inflation and other changes ​to their contracts, but have not disclosed details of their demands.

The negotiations between Norwegian oil companies and the three labour unions cover most workers on Norway’s ​offshore oil and gas installations, and failure to come to an ​agreement can lead to production curtailment.

Offshore Norway, which represents the oil industry in ‌the ⁠wage talks, did not immediately respond to a request for comment.

Norway produces more than 4 million barrels of oil equivalent per day, almost equally divided between crude and natural gas, and any reduction could ​impact markets at ​a time when ⁠Middle East output is curtailed by the Iran war.

Norway is Europe’s largest supplier of natural gas, delivering about ​one-third of the continent’s annual consumption, and it meets around ​15% of ⁠the region’s demand for oil.

Global energy prices have risen sharply this year following the US-Israeli war against Iran and the latter’s attacks on ⁠neighbouring ​countries and a blockade of the Strait ​of Hormuz, a key export route for oil and LNG from the Middle East.