An "immediate conservation investigation" found that "Grainstacks," which Monet painted in 1890 and which sold for $110.7 million at a 2019 auction, sustained no damage from the stunt, as it lies behind a layer of protective glass, the museum said in a statement on Twitter.A Brandenburg police spokesperson did not immediately respond to a question about why the protesters were being investigated for property damage given that the painting was unharmed.Video posted to the Twitter account of the Last Generation, the German climate group that claimed responsibility, shows two protesters hurling mashed potatoes at the painting and then kneeling in front of it and seeming to glue their hands to the wall.The stunt was similar to one this month at London's National Gallery, where two protesters from the U.K. group Just Stop Oil threw what appeared to be tomato soup at Vincent van Gogh's painting “Sunflowers,” which sold for nearly $40 million in 1987, to protest the country's cost-of-living crisis.A report released this year by the U.N.’s Intergovernmental Panel on Climate Change warned that urgent action is needed "to secure a livable future" in the face of climate change, which is already worsening food and water insecurity, and weather events like heat waves, droughts and floods, according to the report."