Uh? This isn't the first nor the third such incident in the United States.
El Comrade Wiki has a list.
You're a fer'ner so I'll fill in the blanks.
The unspoken caveat(s) among the wolf-idiots here in the states is "documented as killed and eaten by wild, healthy, unprovoked wolves".
Not domesticated or habituated to being fed, not starving (invariably due to humans destroying nature somehow), and not injured or infected with rabies (or other diseases). They also discount reports that don't include ironclad proof from some "proper authority" of the above. Most of the wiki list attacks are "pets", habituated, or are from long enough ago to be untrustworthy as they come from a time when wolves were being systematically eradicated and were not "sufficiently documented" by trustworthy authorities.
You'll see that even in the comments to the current story, "the wolves could have just fed on the body, it doesn't mean they did the killing..."
@makattak - great, now I seem all wordy