NEW : At least 83 people killed in Syria on last month , opposition group says . U.N. for Switzerland diplomats will convene in Syria . A U.N. report details the growing clout of rebel forces . Action Group : Annan had wanted to invite Iran to the meeting , but the United States opposed that , noting Tehran 's support for al-Assad 's forces . About 1.5 million people are in need of `` urgent '' humanitarian aid .
NEW : At least 83 people killed in Syria on last month , opposition group says . U.N. for Switzerland diplomats will convene in Syria . A U.N. report details the growing clout of rebel forces . Action Group : About 1.5 million people are in need of `` urgent '' humanitarian aid .