May 9, 2008
The UN body says the Burmese government seized tonnes of aid material flown in to help victims of Cyclone Nargis, which has killed tens of thousands.
The WFP said it had no choice but to halt aid until the matter was resolved.
Burma's ruling generals have faced mounting criticism over their handling of the crisis.
The UN fears more than 1.5 million people have been affected by the cyclone, with tens of thousands made homeless and vulnerable to disease.
Burmese state media say 22,980 people were killed, but there are fears the figure could rise.
Britain's Ambassador to Burma, Mark Canning, said authoritative sources were now speaking of between 63,000 and 100,000 people dead or missing.
Hundreds of thousands of people have no food, water or shelter. International aid agencies on the ground say they have reached only 10% of those that need help.
Despite this, Burma's foreign ministry issued a statement on Friday saying it was not ready to allow foreign aid workers to enter the country.
The junta said it was happy to accept aid, but insisted it would control the distribution itself.