Climate activists struck again on Sunday, throwing mashed potatoes on a painting by French Impressionist Claude Monet in a German museum.

Two climate activists, a man and a woman, tossed a yellow substance onto the painting before kneeling below it and gluing one of their hands to the wall, according to the New York Times. The woman then spoke in German about the world’s climate crisis and claimed that “all you are afraid of is tomato soup or mashed potatoes in a painting,” the Times reported.

“Grainstack,” an oil on canvas of hay stacks in a field created by Monet around 1890, was on exhibit in the Museum Barberini in Potsdam, Germany. It was undamaged in the attack thanks to protective glass covering it.

Both activists were arrested after their protest. The two are members of the climate change advocacy group called The Last Generation, which posted a video of the act on its Twitter feed.

Earlier this month, activists associated with a different environmental activist group threw tomato soup on a Vincent van Gogh painting on display in the National Gallery in London. That painting was also unharmed.

The soaring cost of energy, coupled with the continued reliance on fossil fuels, has led to increased climate activism in recent months. The growing emissions of greenhouse gasses has been linked to the burning of fossil fuels and is the primary driver of climate change.