The dominant formation of Zimbabwe's opposition Movement for Democratic Change on Thursday accused the long-ruling ZANU-PF party of putting a "full stop" to power-sharing talks by initiating a new wave of violence.
The MDC formation headed by prime minister-designate Morgan Tsvangirai said ZANU-PF militants have been attacking opposition supporters in Harare and other cities, and setting up what it described as "torture bases" in the capital.
The MDC said ZANU-PF's alleged actions violated the power-sharing agreement signed in September, and have extinguished dialogue on forming a unity government.
For more on the MDC chargers, reporter Ntungamili Nkomo of VOA's Studio 7 for Zimbabwe turned to Tsvangirai formation spokesman Nelson Chamisa.
The South African government, meanwhile, turned up pressure on Harare saying that it is concerned at the slow pace of power-sharing negotiations and will push for agreement between ZANU-PF and the MDC at a regional summit Sunday in South Africa.
Cabinet spokesman Themba Maseko said Pretoria was going to take a hard line with the government of President Robert Mugabe.
Meanwhile, Tsvangirai has been shuttling around the region seeking support from leaders of the Southern African Development Community ahead of the summit.
Reporter Nkomo interviewed Tsvangirai spokesman George Sibotshiwe.