http://www.bbc.co.uk/news/world-asia-pacific-13032122A powerful earthquake has hit north-east Japan, exactly one month after the devastating earthquake and tsunami.
The 7.1-magnitude tremor triggered a brief tsunami warning, and forced workers to evacuate the crippled Fukushima nuclear plant.
The epicentre of the quake was in Fukushima prefecture, and struck at a depth of just 10km (six miles).
The latest tremor struck shortly after the country stopped to observe a minute's silence to remember the nearly 28,000 dead or missing in the 11 March disaster.
