The military government in Burma has said at least 10,000 people have been killed in this weekend's cyclone.
Many more thousands are now homeless after the devastating storm.
As Myanmar's authorities announced the revised toll from Tropical Cyclone Nargis, the United Nations said it already had teams working flat out after the cyclone.
Burma's military authorities have given the UN permission to send emergency aid to help the victims.
State television reported that nearly 4,000 people have been killed and thousands more are missing in the storm.
'The confirmed number is 3,934 dead, 41 injured and 2,879 missing within the Yangon and Irrawaddy divisions,' it said.
Initially the number of dead was reported to be 351.
Elsewhere, US First Lady Laura Bush has accused the Burmese military regime of failing to alert its citizens in time to the approaching cyclone which ravaged the country.
She added that the US is ready to send aid to Burma.
She urged the reclusive military leadership to quickly accept such offers of international help.
Meanwhile, the military junta has said it will go ahead with a referendum on a new constitution planned for next Saturday despite the massive cyclone.
The country’s generals say the ballot will usher in democratic multi-party general elections in 2010, but critics say it will only solidify their grip on power.
Detained opposition leader Aung San Suu Kyi's National League for Democracy and other pro-democracy groups are calling for a No vote at the referendum, but they have little ability to campaign effectively because the junta has outlawed speeches and leaflets about the referendum.