[Ads-l] attorneys generals

[MULLINS, WILLIAM D (Bill) CIV USARMY RDECOM AMRDEC (US)]

I've seen both "attorneys general" and "attorney generals" used as plural for "attorney general" (and both have been discussed here, as well).

But the Washington Post recently used "attorneys generals":
https://www.washingtonpost.com/politics/courts_law/supreme-court-wont-review-marylands-law-banning-sales-of-assault-weapons/2017/11/27/ad68ce42-d380-11e7-95bf-df7c19270879_story.html

" But attorneys generals in 21 states had asked the court to step in."

Typo?  Mistake on the part of the author?  Correct but uncommon usage?


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