BOISE, Idaho (AP) -- Idaho game wardens say they have closed their investigation into the death of six juvenile wolves discovered on public land in southwestern Idaho.

The partially decomposed carcasses were found on land managed by the U.S. Forest Service north of Fairfield on Aug. 21. Necropsies were done, but yielded no conclusions for cause of death.

The analysis did not find any evidence poison was used, and officials say it doesn't appear the young wolves were shot or physically injured.

Idaho Fish and Game officials say the wolves were found in a remote area within 400 yards of each other. All six died over the course of several days.

The department has also closed the criminal portion of its investigation.

Copyright 2009 The AP.

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