South Ossetia on edge of warBy Temuri Kiguradze and Winston FeatherlyDiplomats are pushing urgent peace talks between Georgian and South Ossetian officials to avert all-out war as heavy fighting in the region killed at least a dozen yesterday.Tensions have only escalated in breakaway South Ossetia after severe violence last weekend, and show no sign of abating. The conflict zone fell briefly quiet after that, but growing clashes have pushed the situation to the edge over the last several days.Both sides reported heavy shootouts overnight Wednesday that continued into the day. By yesterday evening, the South Ossetians counted two dead and 18 wounded. Separatists had claimed the day before there were Georgian artillery attacks from the heights above Prisi. Tamarasheni, a Georgian town a stone’s throw from Tskhinvali, also came under fire last night, according to the Georgian Interior Ministry.Tbilisi accuses the separatists of starting the violence.