Authorities in north-east Japan ordered a general evacuation and workers at the damaged Fukushima Daiichi nuclear plant took shelter after an earthquake triggered a new tsunami warning.
However, the tsunami warning was lifted after 90 minutes and the earthquake – with a magnitude of 7.1 – did little obvious damage.
Fukushima officials said the quake had no detectable effect at the plant.
Last month’s 9.0 earthquake set off a tsunami which devastated the region.
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