Dr Mwanawasa has been buried amid a sombre mood in Lusaka. He was buried at the embassy park opoosite cabinet office.
11 heads of state were present including Zimbabwe's Robert Mugabe who Mwanawasa openly criticised. Other dignitaries were also present.
Mugabe said Dr Mwanawasa was a couragous leader who wanted to change Zambia and the world.
Mrs Mwanawasa led their six children in laying wreaths. She weeped as the copper casket was lowered into the tomb.
Under Zambia's current constitution, elections for a new President should take place within 90 days.
15 candidates from the ruling MMD party have filed in their applications to contest the presidency on the party's ticket.
Many people have paid tributes to Dr Mwanawasa.
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MAY DR MWANAWASA'S SOUL REST IN PEACE.