The U.S. Fish and Wildlife Service said Friday it is investigating the deaths of 25 Pacific walrus found on an isolated northwest Alaska beach.

A person connected to an Air Force radar station in the remote area spotted the animals and notified the agency this week. The walrus included 12 pups, and some were missing their heads and tusks.

The cause of death has not been determined, said Fish and Wildlife Service spokeswoman Andrea Medeiros, and investigators do not want to speculate.

"We can't come to any conclusions based on a report," she said Friday. "You have to go out and investigate."

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