Yangon.– Almost 4,000 people were killed and nearly 3,000 others are unaccounted for after a devastating cyclone in Myanmar, a state radio station said Monday.

Foreign Minister Nyan Win told foreign diplomats at a briefing that the death toll could reach 10,000, according to diplomats who spoke on condition of anonymity because the meeting was held behind closed doors.

Tropical Cyclone Nargis hit the Southeast Asian country, also known as Burma, early Saturday with winds of up to 120 mph, leaving hundreds of thousands of people homeless.

The government had previously put the death toll countrywide at 351 before increasing it Monday to 3,939.

The radio station broadcasting from the country's capital, Naypyitaw, said that 2,879 more people are unaccounted for in a single town, Bogalay, in the country's low-lying Irrawaddy River delta area where the storm wreaked the most havoc.

The situation in the countryside remained unclear because of poor communications and roads left impassable by the storm.

"It's clear that we're dealing with a very serious situation. The full extent of the impact and needs will require an extensive on-the-ground assessment," said Richard Horsey, a spokesman in Bangkok, Thailand for United Nations Office for the Coordination of Humanitarian Affairs.

"What is clear at this point is that there are several hundred thousands of people in dire need of shelter and clean drinking water," Horsey said.

U.N. agencies were working with the Red Cross and other organizations to see how it can help those affected by the cyclone. UNICEF spokeswoman Veronique Taveau said the U.N. children's agency alone has five teams assessing the situation in the country.

At a meeting with foreign diplomats and representatives of U.N. and international aid agencies, Myanmar's foreign ministry officials said they welcomed international humanitarian assistance and urgently need roofing materials, plastic sheets and temporary tents, medicine, water purifying tablets, blankets and mosquito nets.

Neighboring Thailand announced that it would fly some aid in Tuesday.