Russia tonight claimed it had sunk a Georgian missile boat that was trying to attack its ships in the Black Sea, news agencies reported.
If confirmed, the incident could mark a serious escalation of fighting despite President Saakashvili's call for a ceasefire and the government saying it was withdrawing troops from South Ossetia.
Earlier tonight, Georgian Interior Ministry spokesman Temur Yakobashvili said a group of Russian tanks had attempted to cross from South Ossetia into the territory of Georgia proper, but were turned back by Georgian forces.
He said the tanks apparently were trying to approach Gori, a city of about 50,000 near the South Ossetian border. He said the tanks did not fire on the city, however.