Burma junta 'seals cyclone zone'

Burma's military rulers have tightened access to areas hit by Cyclone Nargis, in spite of international pleas to allow foreign aid workers in.

A UN official in Rangoon says the military has erected more checkpoints to make sure foreigners cannot get to the worst-affected areas.

Thai Prime Minister Samak Sundaravej is in Burma trying to urge the generals to allow aid agencies to help the victims.

Meanwhile, forecasters say another cyclone is forming off Burma's coast.

The Hawaii-based Joint Typhoon Warning Center said on its website that "a significant tropical cyclone" could develop in the next 24 hours.

Aid agencies are warning that the ruling generals' refusal to sanction a major international relief effort will cause more deaths.