Recent arrests and political violence against opposition supporters in Zimbabwe has "killed the dialogue" on forming a unity government with President Robert Mugabe, an opposition spokesperson said on Thursday.

Over the last two weeks, Mugabe's ruling Zanu-PF party has led a fresh campaign of attacks against supporters of the opposition Movement for Democratic Change (MDC), the party's spokesperson Nelson Chamisa said in a statement.

"Zanu-PF has unleashed a new orgy of brutality and assaults across the whole country," the statement said.

"Zanu-PF has killed the dialogue despite the hopes, patience and expectations of the people of Zimbabwe," he added.

"It is quiet evident that Zanu-PF has put a full stop to that dialogue," he said.

The statement was released as southern African leaders prepare to meet on Sunday in South Africa to save a power-sharing deal signed by Mugabe and MDC leader Morgan Tsvangirai on 15 September.

Chamisa told AFP that Tsvangirai would still attend the summit, but said the attacks highlight Mugabe's lack of sincerity in the negotiations.

"Zanu-PF has to be honest and publicly say we no longer want these talks," he said.

At least 25 MDC supporters were attacked in a Harare township on 27 October by a ruling party militia, the statement said.

Three days later security agents raided the home of a local MDC leader in the town of Banket, arresting nine people, including a two-year-old girl, it added.

The MDC also said that more than 100 activists remained in prison after they were arrested for holding a march during regional talks in Harare on 28 October.

AFP