Zimbabwe ? President Robert Mugabe agreed to share power with the opposition Thursday after more than two decades as Zimbabwe’s unchallenged leader, South Africa’s president announced.

South African leader Thabo Mbeki, who mediated at the negotiation, did not immediately offer details, but said the agreement would be signed and made public Monday.

“I am absolutely certain that the leadership of Zimbabwe is committed to implementing these agreements,” Mbeki said at a news conference late Thursday.

Opposition leader Morgan Tsvangirai also told reporters the parties “have got a deal.” There was no immediate statement from the 84-year-old Mugabe.

There was no indication of how they would share power.