He refers to a news release prepared by his staff [maybe you'll have better luck opening it than we're having right now] and tells KTAR (92.3 FM) news radio that "the inmates want to be segregated." In a bit of Internet snark, he also posted the above tweet.
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We'll find out more about this near-whatever-it-is later, but part of the story here seems to be how this story broke -- by a direct message from the sheriff (or his stenographer).
Arpaio's not afraid to admit it's his birthday or that he woke up at 2:30 in the afternoon on a Monday.