Satellites watched as floodwaters ravaged southern Ukraine following the mysterious collapse of a major dam on Tuesday (June 6).

Floodwaters have been threatening crops and villages throughout war-torn Ukraine, prompting evacuations and what U.N. Secretary-General Antonio Guterres called a “monumental humanitarian, economic and ecological catastrophe,” according to the Associated Press. Russia and Ukraine are accusing each other of destroying the dam in what both are calling a “terrorist act.”