Daw'r newyddion am y pwerau brys wrth i Brif Swyddog Meddygol Cymru gadarnhau dau achos newydd o COVID-19 yng Nghymru, gan ddod â chyfanswm yr achosion i bedwar.
News of the emergency powers comes as the Chief Medical Officer for Wales confirmed two new cases of COVID-19 in Wales, bringing the total number to 4.