A search team is being assembled to look for a hiker who rang police after becoming lost in Arthur's Pass National Park.

The hiker, who is alone on or near the Mt Aitken Track, phoned police at 12.15pm, a spokesperson said.

Police did not have the person's age or sex. A search and rescue team was assisting.

The Mt Aitken Track is described by the Department of Conservation as an advanced tramping track.

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The weather in the area is partly cloudy and 17C.