Tensions between Georgia and Russia began escalating in April 2008. A bomb explosion on 1 August 2008 targeted a car transporting Georgian peacekeepers. South Ossetians were responsible for instigating this incident, which marked the opening of hostilities and injured five Georgian servicemen. In response, several South Ossetian militiamen were hit. South Ossetian separatists began shelling Georgian villages on 1 August. These artillery attacks caused Georgian servicemen to return fire periodically since 1 August.