FILE - Federal Chancellor Sebastian Kurz (OEVP) (Foreground) and President of the European Council Charles Michel (background) on a visit of condolence following the terrorist attack of November 2 at Federal Chancellery on November 9, 2020 in Vienna, (Martin Juen/SEPA.Media /Getty Images)BERLIN - Austria announced Saturday that it is tightening its partial lockdown, including by closing non-essential stores and shifting schools to online teaching, amid galloping coronavirus infection rates in the Alpine nation.Chancellor Sebastian Kurz said the measures had become necessary because Austria has seen 550 new cases of coronavirus per 100,000 inhabitants in the past week, a level 11 times greater than what authorities said would be.