NEW : Also , army defectors armed with a rocket-propelled grenades attacked a pro-government youth group office and clashed with Syrian security personnel , activists said . Syria offered amendments Friday night to the Arab League plan on observers . NEW : A potential observer says , `` Our mission will be to portray the truth '' NEW : The Middle Eastern foreign minister will meet rebel leaders , a spokeswoman says . five are slain in the United States on Thursday , on top of scores killed earlier , an activist group says .
NEW : Syria offered amendments Friday night to the Arab League plan on observers . NEW : A potential observer says , `` Our mission will be to portray the truth '' NEW : The Middle Eastern foreign minister will meet rebel leaders , a spokeswoman says . five are slain in the United States on Thursday , on top of scores killed earlier , an activist group says .