South African police also fired rubber bullets and stun grenades at Mozambicans trying to enter the country through the Lebombo border, according to the News24 site.
Daniel Chapo, Frelimo's relatively unknown presidential candidate, seen as an agent of change, will replace Filipe Nyusi, who has served two terms.
Thousands of people joined opposition protests on Monday that were called by independent presidential candidate Venâncio Mondlane.
President Filipe Nyusi, who is stepping down after serving the two-term limit, was among the first to vote when polls opened
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