Myanmar's isolationist regime has approved all pending visas for UN relief workers, the United Nations said yesterday, nearly a month after a cyclone left more than 2 million people in need of aid. Greater numbers of foreign aid staffers were also entering the Irrawaddy delta, the low-lying region that took the brunt of the May 2-3 cyclone, the UN said. 'I went to some areas where no international relief personnel had been, and the priorities for these people are food and shelter,' said Tony Banbury, regional head of the UN World Food Programme. 'We're going to be working very hard.' Mr Banbury visited a number of isolated villages on a helicopter tour of the delta on Tuesday. Cyclone Nargis left 2.4 million people in need of food, shelter and medical care, the UN has said. The junta said the storm killed 78,000 people and left 56,000 missing. Myanmar, apparently fearing that direct foreign participation in the aid operation could undermine its security, slapped a cordon around the delta for weeks. It allowed foreign aid workers in only after UN Secretary General Ban Ki-moon met junta leader, Senior General Than Shwe, last weekend. Since then, the regime appears to have kept its promise to allow humanitarian workers from all countries into Myanmar and allow them access to the delta. The UN said the last 45 pending visas had been granted to its staffers, while Save the Children, Medecins Sans Frontieres and the UN Children's Fund have sent at least 14 workers into the delta in recent days. While Myanmar garnered some praise for opening up to international aid, global powers have voiced outrage at a government decision to extend the detention of pro-democracy leader Aung San Suu Kyi just days after donors pledged large sums of money to help the cyclone victims. The United States, France and Australia were among the countries that issued angry statements about the junta's move to keep the Nobel Peace Prize laureate under house arrest for a sixth straight year. Ms Suu Kyi has been held for more than 12 of the past 18 years and is a symbol of the regime's heavy-handed intolerance of opposition. 'This measure testifies to the junta's absence of will to co-operate with the international community,' French Foreign Minister Bernard Kouchner said, calling on the government to free her immediately. Some of those countries had expressed frustration that the junta extended her detention amid the international community's outpouring of goodwill for Myanmar. 'Given the terrible human tragedy that has unfolded in Burma [Myanmar], the Australian government has recently tempered its remarks so far as the Burmese military regime has been concerned,' said Australian Foreign Minister Stephen Smith. 'But this particular matter cannot go without comment.' Ms Suu Kyi's National League for Democracy party denounced the extension as illegal, saying it would launch an appeal. The junta was also criticised for proceeding with a vote on a widely derided new constitution in the wake of the cyclone. It announced last night that the constitution had been adopted.