One person is dead and another critically injured in a "serious incident" in Motueka tonight.

Police released the details just after 11pm after earlier saying officers had been called to an incident in the town in the Tasman District.

"The circumstances of the incident - which occurred about 8.40pm - are not clear," a statement said.

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"Further information will be released tomorrow."

St John confirmed just before 9.30pm that it was also at the scene.

Police earlier said that the incident did not appear to be related to the fires that had been burning in nearby Nelson over the last few days.