On September 11 122mm artillery systems were used against Ukrainian army positions in the Mariupol sector for the first time since the imposition of full ceasefire. Twelve artillery shells exploded in the area. In addition the use of 120mm and 82mm mortars were obseved during that day.According to the report, most shelling incidents were random and provocative, seeking to prompt the Ukrainian army to return fire and to expose defenses.The Ukrainian army strictly complies with the Minsk agreements and returns fire exclusively in case of a risk to the life of servicemen and civilians and destruction of crucial infrastructures of the region,