Protesters have started to gather to line the funeral route by the Royal Courts of Justice.
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More than 10,000 cases "may have been affected" by alleged data manipulation at a Randox Testing Services forensics laboratory.
The statement by Emmerson Mnangagwa, who was dismissed earlier this month, added to immense pressure on 93-year-old Mr Mugabe to resign.
The military policeman in Brazil shot two suspected robbers in a pharmacy while holding his young son in his arms.