HARARE, Zimbabwe (AP) — South African President Jacob Zuma, the chief regional mediator on Zimbabwe, has arrived in Harare for talks with the leaders of the nation's troubled coalition government.

South African officials said Wednesday that Zuma immediately began talks with Zimbabwe President Robert Mugabe in a suite at a downtown hotel.

Zanele Mugadi, an official in Zuma's office, said the South African leader will wind up discussions overnight with Mugabe, Prime Minister Morgan Tsvangirai and a smaller party in the coalition.

Mugadi said Zuma will travel to neighboring Mozambique on Thursday for a summit of the 15-nation Southern African Development Community, the region's political and economic bloc.

The Harare talks are expected to focus on internal disagreements on a new Zimbabwe constitution and a timetable toward new elections.