The United States is calling for an immediate cease-fire in a conflict between Russia and Georgia over the breakaway Georgian province of South Ossetia.

State Department spokesman Gonzalo Gallegos told reporters Friday that Secretary of State Condoleezza Rice is making calls to top officials urging all parties to remain calm. He did not identify the officials.

He says a U.S. envoy is traveling to the region Friday in hopes of bringing an end to hostilities. Gallegos did not name the envoy, who will meet with U.S. allies and others.

He says the U.S. supports Georgia’s territorial integrity.

Georgian troops have launched a major military offensive to regain control over South Ossetia. The fighting prompted Russia to respond by sending in tanks.