NEW : At least 83 people killed in Syria on Wednesday , opposition group says . Action Group for Syria diplomats will convene in Switzerland . Comment: U.N. : About 1.5 million people are in need of `` urgent '' humanitarian aid .
NEW : At least 83 people killed in Syria on Wednesday , opposition group says . Action Group for Syria diplomats will convene in Switzerland . A U.N. report details the growing clout of rebel forces . U.N. : About 1.5 million people are in need of `` urgent '' humanitarian aid .