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Libya’s increasingly violent leader attempted to rally his loyalists again on Friday, appearing in Tripoli and promising to “crush any enemy” by opening up his arms arsenals to his supporters. Gaddafi backed his tough words with a series of violent clashes in Tripoli Friday, in which his troops opened fire on protesters as they exited mosques. Meanwhile, the U.S. has imposed unilateral sanctions on the war-torn nation, shuttered its embassy there, and ferried American citizens to nearby Malta.