Authorities have often arrested critics of President Mugabe, who has ruled since 1980.

GRACE

In March, two journalists were arrested over a report that the president, who travels abroad for regular medical treatment, was "in bad shape".

A pastor was also detained after prophesying that Mr Mugabe would die on October 17 this year.

Last week, police arrested a journalist who reported that Mr Mugabe's wife Grace had donated second-hand underwear to supporters.

Despite his advanced age and weakening health, Mr Mugabe's ruling Zanu-PF party has endorsed him as its candidate for the 2018 General Election.a

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