A strong earthquake has struck off the coast of the Pacific island nation of Fiji. There are no immediate reports of injuries or damage and no tsunami warning has been issued. The U.S. Geological Survey says the 6.6-magnitude quake struck Friday about 390 miles (630 kilometers) south of the capital Suva at a depth of 328 miles (528 kilometers), according to AP. The Pacific Tsunami Warning Center did not issue a tsunami warning. Earthquakes occur regularly in the South Pacific, where several tectonic plates converge.