Political violence in the campaign for this month's presidential run-off in Zimbabwe has spread to urban areas around the capital Harare, reports say.
A top UN official is due in Zimbabwe for a five-day visit ahead of the presidential run-off, which continues to be marred by political violence.
Some opposition supporters complained of being attacked in a township near the city.
Haile Menkerios is expected to meet politicians to discuss the situation in the run-up to the 27 June vote.
The area had been largely quiet while violence flared in rural districts.
Violence is reported to have spread to urban areas near Harare, with opposition activists complaining of being attacked near the city.
And a top opposition figure is expected in court to face treason charges.
Tendai Biti, secretary-general of the Movement for Democratic Change (MDC), was arrested when he returned from neighbouring South Africa on Thursday.
At the time of his arrest, national police spokesman Wayne Bvudzijena said Mr Biti would be charged with treason "for publishing a document that was explaining a transitional strategy around March 26".
The charges carry a possible death sentence.
'War' claim
The area around Harare had been largely quiet while violence flared in rural districts.
One opposition supporter told a local journalist he had been abducted and beaten by supporters of President Robert Mugabe's Zanu PF.
One opposition supporter told a local journalist he had been abducted and beaten by supporters of President Robert Mugabe's Zanu PF.
Earlier, Mr Mugabe vowed the main opposition party would never lead Zimbabwe and said he was prepared to "go to war" for his country.
Earlier, Mr Mugabe vowed the main opposition party would never lead Zimbabwe and said he was prepared to "go to war" for his country.
He is due to face Morgan Tsvangirai, leader of the Movement for Democratic Change, in the 27 June run-off poll.
He is due to face MDC leader Morgan Tsvangirai in the run-off poll.
Mr Tsvangirai was earlier released having been being arrested for the fifth time in just nine days.
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