A strong 6.4-magnitude earthquake has struck off the Pacific nation of Tonga, US seismologists say.
There are no immediate reports of damage and no tsunami warning has been issued.
The quake happened at 11.08pm (2008 AEST) on Saturday 78 kilometres from the town of Neiafu, on the south coast of the island Vava'u, at a depth of about 130 kilometres, the US Geological Survey (USGS) said.
The USGS had initially said the quake had a magnitude of 6.7.
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