Fifteen have been hospitalized and 13 of those were being fed through tubes, Behrens said in a written response to questions from The Associated Press. Medics are monitoring all 89 and checking their vital signs daily, he added.

I see that we're getting plenty of valuable information out of them. When people get to this point, something is very seriously wrong.

U.S. Military Tube-Feeds 13 Gitmo Strikers