JOHANNESBURG (AP) ― South Africa expects overwhelming crowds and a host of world leaders to attend services honoring late President Nelson Mandela, though with the ceremonies only days away officials acknowledged Saturday they couldn’t offer any specifics yet.

Across the country, South Africans already have begun honoring Mandela, who died Thursday at age 95, and officials expect tens of thousands to participate in this week’s official services.

Official services honoring Mandela begin Tuesday with a major memorial planned at FNB Stadium on the edge of Johannesburg’s Soweto township. Government Minister Collins Chabane told journalists Saturday he expects massive crowds far beyond what the stadium’s normal 95,000-person capacity could hold. He said there would be “overflow” areas set up.

“We can’t tell people not to come,” he said.

He couldn’t offer specifics about how crowds would arrive there with all roads to the venue closed by police or who would serve as a master of ceremonies.

It’s unclear which ceremony world leaders will attend, either Tuesday’s stadium memorial or the planned funeral service Dec. 15 in Qunu, the Nobel Peace Prize laureate’s rural hometown in Eastern Cape Province. Chabane said South African officials briefed diplomats Saturday about the arrangements, though they would leave it to foreign governments to say which event their leaders would attend.

U.S. President Barack Obama and his two predecessors, George W. Bush and Bill Clinton, already have indicated they will attend services in South Africa honoring Mandela. Many other world leaders also are expected.

Mandela’s body won’t be at the stadium event Tuesday, Chabane said. His body will rest in state Wednesday, Thursday and Friday at the Union Buildings in Pretoria, the seat of government power in South Africa’s capital.

Mourners will walk up the steps into the Union Buildings’ amphitheater and file past Mandela’s body, Chabane said. Authorities blocked visitors from visiting the amphitheater Saturday.

ANC members will hold a ceremony on Dec. 14 at Waterkloof Air Force Base near Pretoria before Mandela’s body is flown to Qunu from there, Chabane said.

Sunday has been declared a national day of prayer and reflection over Mandela’s death. On Monday, South Africa’s two houses of parliament will hold special sessions to pay tribute to Mandela, the country’s first black and democratically-elected president.

Tributes to the former anti-apartheid activist continued to pour in from around the globe. Zimbabwean President Robert Mugabe, who has been in power since his country’s independence from Britain in 1980 and supported Mandela’s ANC during its struggle against the apartheid regime, paid his first public tribute to the deceased leader.

Despite himself being accused by critics of increasingly authoritarian rule, Mugabe praised Mandela as a champion of democracy and “an unflinching fighter for justice.”

Hundreds gathered Saturday at Mandela’s house in Houghton. They sang liberation songs and walked past expansive, stately homes carrying bundles of flowers and images of Mandela.