This new sentencing guideline encourages courts to use their full powers when dealing with offenders so that they are jailed where appropriate. It also gives guidance to courts on making the best use of their powers so that people can be banned from keeping dogs, genuinely dangerous dogs can be put down and compensation can be paid to victims.
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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.