An official in the Kursk border region of Russia on Monday urged more residents to evacuate due to the “very tense situation” in the area, where Russian forces are still scrambling to respond to a surprise Ukrainian attack after almost a week of fierce fighting.

Russia’s emergency authorities say more than 76,000 people have fled their homes in areas of Kursk, where Ukrainian troops and armor poured across the border on Aug. 6, reportedly driving as deep as 30 km into Russia and sowing alarm.