AlQa'dah 20, 1433, Oct 6, 2012, SPA -- The continued exchange of artillery fire between Syria and Turkey raises additional concerns that the conflict may escalate and spread to neighboring countries, AP quoted Defense Secretary Leon Panetta as saying Saturday. Panetta said the U.S. is using its diplomatic channels to relay worries about the fighting in the hopes that it will not broaden. His comments came on the heels of warnings from Turkey's prime minister that his country is not far from war with Syria. Turkish and Syria traded artillery fire Saturday as opposition fighters clashed with the regime of Bashar Assad's forces near the border, heightening the fears that the crisis could erupt into a regional conflict. Turkish Prime Minister Recep Tayyip Erdogan on Friday cautioned Damascus not to test Turkey's "limits and determination" and said Ankara was not bluffing in saying it won't tolerate such acts. Panetta is leaving Peru and will fly to Uruguay Saturday afternoon to attend a regional meeting of defense ministers from the Americas.