A magnitude-6.6 earthquake struck south-western Japan early Monday, the Meteorological Agency said.

No casualties or damage were reported and no tsunami warning was issued.

The quake jolted the region at 5:11 am with its seismic centre off the north-western coast of the main Okinawa island, at a depth of 120 kilometres, the agency said.

The quake registered intensity 4 on the Japanese seismic scale of 7 in several areas of Okinawa, 1,600 kilometres south-west of Tokyo.

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