Zimbabwe's opposition party says it has formally resolved not to participate in a presidential runoff. An official with the Movement for Democratic Change says the party leadership met Thursday and voted not to run a candidate if the ruling party tries to call for a second round. Party leaders had previously said they would not accept a runoff but had not taken an official stance.

Twelve days after the vote, the results from the presidential race have not been released.

But the opposition says its candidate won the vote outright.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

HARARE, Zimbabwe (AP) - President Robert Mugabe and his chief rival will attend an emergency summit of southern African leaders to present their conflicting views of the crisis paralyzing the country in the wake of hotly contested elections, spokesmen for the men said Thursday.

The opposition Movement for Democratic Change says its candidate, Morgan Tsvangirai, won the March 29 vote outright, and accused Mugabe of delaying the results so he can orchestrate a runoff and give ruling party militants time to intimidate voters and ensure he wins a second election.

With no resolution in sight, Zambian President Levy Mwanawasa called an emergency summit of the Southern African Development Community for Saturday to discuss the crisis.

"Such meetings are usually very healthy so heads of state can brief each other, not only us in Zimbabwe," Zimbabwean Information Minister Sikhanyiso Ndlovu told The Associated Press.

But he insisted the meeting wasn't necessary. "There is no crisis in Zimbabwe that warrants a special meeting on Zimbabwe," he said.

Mwanawasa originally planned to send a delegation of former heads of state to Zimbabwe but decided to hold an urgent summit instead, Zambian state radio reported.

Deputy Information Minister Bright Matonga confirmed Mugabe would attend. "If there is a SADC meeting of heads of state, then obviously he will attend," he told the AP.

Tsvangirai also will also attend the summit, MDC spokesman Nqobizitha Mlilo said, calling him a "head of state" and reiterating the opposition's insistence that Tsvangirai won the presidential election.

Tsvangirai, who was traveling throughout the region to ask Mugabe's peers to push him to end the standoff, was headed Thursday to South Africa to meet with President Thabo Mbeki, Mlilo said.

"If Mr. Tsvangirai is in town and before the president leaves for the next meeting and his program allows it, it is important to hear what Mr. Tsvangirai has to say," said Aziz Pahad, South Africa's deputy foreign affairs minister.

African leaders previously deferred to Mbeki and his strategy of "quiet diplomacy" on dealing with Zimbabwe. Mwanawasa has stood out as the only southern African leader to publicly criticize Mugabe's policies, last year likening the country's economy to "a sinking Titanic."

But MDC secretary-general Tendai Biti said regional leaders should push for Mugabe's resignation.

"We don't know why the world has to wait until dead bodies start littering the streets of Harare," he said Wednesday, hinting that the opposition would boycott any runoff.

"Morgan Tsvangirai won this election without the need for a runoff, and we will not accept any other result except one that confirms that we won this election," he said.

Twelve days after the vote, the results from the presidential race have not been released. The High Court will decide Monday whether to grant an opposition request for release of the election results.

The influential Southern African Catholic Bishops Conference called Thursday for the appointment of a high-level mediator in Zimbabwe, according to the South African Press Association.

Mugabe has virtually conceded he did not win the election and appears to be campaigning for a runoff by intimidating his foes and fanning racial tensions.

Biti accused the ruling party of deploying senior army and police officials across the country to "oversee the reversal process."

Desmond Mufunde, a newly elected MDC councilman from the rural Gweru district, said soldiers attacked some people in his district last weekend.

Zimbabwe's Commercial Farmers' Union accused ruling party supporters of forcing dozens of white farmers off their land and ransacking their homes. Farmers warned that continued chaos could endanger the wheat crop, vital to a nation that has grown deeply dependent on food aid during the worsening economic crisis.

The U.S.-based National Democratic Institute said one of its staff members was detained last week and held for six days before being released.

Meanwhile, trial continued for an American and a Briton arrested for allegedly reporting on the election without proper accreditation. The two were released on bail Monday but their passports are being held and they have not been allowed to leave the country.

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