TV: Quake jolts Japan's Okinawa; 50 cm tsunami warning

An earthquake with a preliminary magnitude of 6.4 jolted Japan's southern Okinawa islands on Monday, public broadcaster NHK said.

The quake, at 2228 local (1328 GMT), was at a very shallow depth, a government agency said. A tsunami warning for waves of up to 50 cm was issued, according to NHK. There were no immediate reports of injuries or damage. (Reuters)