The Japan Meteorological Agency is reporting another magnitude 3.9 aftershock.
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Endris Mohammed must serve a minimum of 33 years after killing his two children with a petrol-soaked cloth before trying to kill his wife.
Three people who had been arrested on suspicion of murder have been released without any further action.
Zimbabwe's ruling party is to hold a meeting after Robert Mugabe ignored an ultimatum to resign or face impeachment.