NEW : Emergency moves after crackdown at Freedom Square . Order sought after protests over last year 's election turned violent . Demonstrators say the election was fraudulent . State of emergency could last until December 20 , official deadline .
NEW : Protest moves after crackdown at Freedom Square . Order sought after protests over last month 's election turn violent . Demonstrators say the election was fraudulent . State of emergency could last until March 20 , official says .