NEW : The opposition said at least 175 people had been killed across Syria on Friday . The U.S. calls the potential use of chemical weapons ` ` completely unacceptable '' Iraq opens border crossings to Syrian refugees . Arab League offers Syria 's president ` ` a safe exit '' if he quickly resigns , leaves Syria .
NEW : The opposition says at least 175 people had been killed across Syria on Monday . The U.S. calls the potential use of chemical weapons `` completely unacceptable '' Iraq opens border crossings to Syrian refugees . Arab League offers Syria 's president `` a safe exit '' if he quickly resigns , leaves country .