Banned incendiary munitions or white phosphorus have been fired at an uninhabited area in eastern Ukraine, Agence France-Presse journalists reported.

Two such weapons, the use of which against civilians is banned under a 1980 Geneva convention, were fired Tuesday from Russian positions to “a road at the southern edge of Chasiv Yar leading to nearby Bakhmut, the center of the longest and bloodiest battle of Russia’s year-long invasion,” according to AFP.

The munitions exploded and released small, burning balls of white phosphorus that set fire to a football pitch-size vegetation on both side of the road.

AFP was not able to confirm if the targeted site was a position held by Ukrainian forces, but a green truck with a white cross, a sign of Ukraine’s army, was parked by a path in the burned area.

Ukraine has accused Moscow of using white phosphorus on several occasions since the start of the war, including against civilians, which the Russian army has denied.