An earthquake with preliminary magnitude of 7.3 has struck off the coast of Fukushima prefecture in Japan.
A tsunami warning for waves of up to three metres has been issued.
The Japan Meteorological Agency says the quake struck around 6 am at a depth of 10 kilometres.
Fukushima prefecture is north of Tokyo and home to the nuclear power plant that was destroyed by a huge tsunami following an offshore earthquake in 2011.
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