NEW : Polls low in presidential election amid low turnout . NEW : Even an extra day of voting did not boost turnout . Human Rights Watch says past crackdowns undermined turnout . Both candidates ' campaigns agreed to another day of voting .
NEW : Polls closed in presidential election amid low turnout . NEW : Even an extra day of voting did not boost turnout . Human Rights Watch says past crackdowns undermined elections . Both candidates ' campaigns objected to another day of voting .