Zimbabwe's political parties have told the BBC that they are unaware of talks, which South African President Thabo Mbeki says they have agreed to. Mr Mbeki said that President Robert Mugabe had agreed to hold formal talks with the opposition to try to solve the country's political impasse. But a senior official of Mr Mugabe's Zanu-PF party told BBC News Online he could not confirm this reported change of position. And a leading figure of the opposition MDC also said it was news to him.