FILE - In this Oct. 2, 2016 file photo, tribesmen loyal to Houthi rebels, hold their weapons as they chant slogans during a gathering aimed at mobilizing more fighters into battlefronts in several Yemeni cities, in Sanaa, Yemen. The U.S. is weighing what military response it should take against Yemen-based Houthi rebels, who U.S. officials say launched two missiles at American warships in the Red Sea on Sunday, the Pentagon said Tuesday, Oct. 11, 2016. (AP Photo/Hani Mohammed, File)
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