The head of the World Food Programme (WFP) on Tuesday called for swift distribution of relief aid to victims of Myanmar's killer cyclone.

"Distribution needs to be more complete and quicker and scaled up even more," WFP executive director Josette Sheeran told a news conference here.

"We are really hoping we will now be able to scale up … to the level that we can reach more people more quickly," she said.

Sheeran, here for this week's Africa-Japan meeting, made the remarks ahead of a trip to Myanmar this weekend.

The May 2-3 cyclone has left more than 133,000 dead or missing and access to devastated areas has been limited by Myanmar's secretive generals.

UN Secretary General Ban Ki-moon has led calls for Myanmar to make good on a pledge to let in outsiders, with 2.4 million victims needing help and many at risk of dying from hunger or disease.

Sheeran also called on African and Japanese leaders to take action against poverty and soaring world food prices during their three-day meeting, which begins here on Wednesday.

"What is most important here is that it is not just a declaration of standing together but a very action-oriented meeting," she said.

Presidents, vice presidents or prime ministers from 44 African countries are due to meet on issues including, poverty, the global food price crisis and development.

South African President Thabo Mbeki and Sudanese President Omar al-Beshir will be among leaders at the Fourth Tokyo International Conference on African Development (TICAD IV), which Japan hosts every five years.