(VOVworld) - The Russian border checkpoint Gukovo crossing was shelled from the Ukrainian side twice on Sunday. The Organization for Security and Cooperation in Europe (OSCE) reported that none of its observers were hurt. OSCE spokesman Shiv Sharma told Russia’s ITAR-TASS that on Sunday, observers twice heard the sound of artillery fire. Sharma has yet been unable to specify the location and shooters but insisted that the shells were fired by the Ukrainian forces and opposition groups in their conflict. He confirmed that the incident would not affect OSCE day-and-night monitoring of the border area.