HARARE, Zimbabwe (AP) - Party officials close to Zimbabwe's power-sharing talks say President Robert Mugabe has agreed to a power-sharing plan with a breakaway opposition faction. They say Arthur Mutambara, who heads a splinter group of the opposition Movement for Democratic Change, has agreed to a power-sharing accord with Zimbabwe's president. No further details are available.The officials from the ruling party and the main opposition movement led by Morgan Tsvangirai spoke on condition of anonymity because mediator Thabo Mbeki has insisted on confidentiality. Mutambara himself would not comment before South African President Mbeki makes a statement.