According to French police, Yellow Vest protesters are now using an ancient form of biological warfare in the newest wave of protests. This weekend, authorities reported that Yellow Vest protesters hurled bags of fecal matter at the police. The rudimentary poop-filled mini bombs were made using thin bags and balloons with the intent that they would easily burst on impact.

Rudy Manna from the Alliance police trade union in the southern port city of Marseille, told the AFP that many of the “bombs” hit their targets.

“Three policemen were soaked through with it,” Manna said.

Marseille police headquarters even reported that one officer was injured when he was hit in the elbow with “a poop-filled projectile.”

Very few pictures of the officers were taken, aside from the photo below which was posted to Twitter.