Media playback is unsupported on your device Media caption The BBC's Andrew Harding: "The very first encounter between storm and land. Not much of a contest"

Aid workers struggling to help survivors of Typhoon Haiyan in the Philippines have described the situation as bleak, one week after the storm tore into the country.

A spokesman for Medecins Sans Frontieres said the logistical issues of distributing aid were enormous.

However, correspondents in the ruined city of Tacloban say US military aircraft are beginning to bring in aid.

Philippine officials say the death toll has now risen to 3,621.

Despite evident frustrations as people waited in long queues for water and fuel, a sense of community spirit and law and order had quickly returned to Guiuan

Interior Secretary Mar Roxas said this figure was as of Thursday and the actual number was likely to be higher.

The Philippine's National Disaster Risk Reduction and Management Council said that there were a total of 2,360 confirmed deaths, while other reports from the ground put the figure higher than Mr Roxas' tally.

The discrepancy is likely to be due to the widespread devastation, making confirming casualties and collating information difficult.

Logistical challenge

Media playback is unsupported on your device Media caption Relief efforts across the worst hit areas are now said to be progressing

Typhoon Haiyan was one of the most powerful storms ever recorded on land.

Henry Gray, of Medecins Sans Frontieres, said workers who had visited Guiuan, in eastern Samar, described the situation faced by the 45,000 people there as "bleak".

"What we saw there was that a public hospital had been, basically, destroyed," he said.

Mr Gray added that local officials had asked the charity to support a local private clinic.

"We are moving this as quickly as we possibly can, but the logistical issues are enormous and they shouldn't be underestimated," he said.

The BBC's Andrew Harding, reporting from near Guiuan, says that after earlier problems with looting, some supplies are now getting in.

Image copyright Getty Images Image caption Survivors are queuing at Tacloban airport for flights out of the city

Image copyright AP Image caption Aid is starting to reach some areas ravaged by the storm including Tacloban and Guiuan

Image copyright Getty Images Image caption The US has deployed aircraft carriers and cruisers to the Philippines to help relief efforts

Image copyright AP Image caption The widespread devastation makes it difficult to determine the full extent of the damage caused by the storm

As a huge international relief operation swung into action, aircraft carrier the USS George Washington and two cruisers arrived in Philippine waters on Thursday.

The carrier is expanding search-and-rescue operations and providing a platform for helicopters to move supplies.

The US military says its support will be on an unprecedented scale, with other US vessels due to arrive in about a week.

Pallets loaded with food and water have been taken from the aircraft carrier to Tacloban, the capital of badly hit Leyte province, and Guiuan.

Aid at a glance Asian Development Bank: $500m (£312m) emergency loans and $23m in grants Australia: A$30m ($28m, £17m) package, including aircraft, medical staff, shelter materials, water containers and hygiene kits China: 10m yuan ($1.6m; £1m) in relief goods plus $200,000 (£120,000) from government and Red Cross European Commission: $11m (£6.8m) Indonesia: Logistical aid including aircraft, food, generators and medicine Israel: 148-person team, including search, rescue and medical services; field hospital with 100 tonnes of aid Japan: $50m (£31m), including tents and blankets. Pledged up to 1,000 soldiers, 25-person medical team already sent South Korea: $5m (£3.1m) plus a 40-strong medical team UAE: $10m (£6.2m) in humanitarian aid UK: $32m (£20m) aid package, sending aircraft carrier, destroyer and large transport aircraft US: $20m (£12.4m) in humanitarian aid, 300 military personnel, aircraft carrier and other ships, military aircraft plus logistics support This list is not comprehensive Donate to the Disasters Emergency Committee (DEC) In pictures: Aid ramps up Typhoon Haiyan: Aid in numbers Q&A: Haiyan disaster management

Sebastian Rhodes Stampa, head of a UN disaster assessment team, said: "There is a danger of focusing on Tacloban."

"We need to get [aid] out to other parts of Leyte and Samar as soon as possible... we'll be here for some time to come."

'Massive need'

Many of the dozens of bodies lying in the open since Typhoon Haiyan struck are now being cleared from the streets and buried.

Despite the relief effort, thousands of survivors continued to line up at Tacloban's airport on Thursday trying to leave the city.

A BBC correspondent at the scene said there was still no large-scale food distribution taking place.

But on Friday Mr Roxas, the interior secretary, defended the government's relief efforts.

"In a situation like this, nothing is fast enough," he said. "The need is massive, the need is immediate, and you can't reach everyone."

Mr Roxas, who is overseeing the response, said with roads blocked and infrastructure destroyed it had been hard to get relief supplies out to those in need.

Media playback is unsupported on your device Media caption Philippines Interior Secretary Mar Roxas: "In a situation like this nothing is fast enough"

He said he only had eight trucks for the entire city of Tacloban and its population of almost a quarter of a million.

Many countries have pledged help in the shape of financial aid, relief supplies or emergency teams.

The UK government is sending the aircraft carrier HMS Illustrious, more than £20m ($32m) in aid, a team of medical experts and an RAF transport aircraft.

Japan is also preparing to send up to 1,000 troops as well as naval vessels and aircraft. On Friday, it pledged a $40m (£25m) disaster-relief grant to the Philippines, in addition to an earlier $10m pledge, Japanese media reported.

Media playback is unsupported on your device Media caption The BBC's Rajesh Mirchandani says that from the air the city of Tacloban still lies in ruins

China - which is engaged in a territorial dispute with the Philippines - is sending 10m yuan ($1.6m; £1m) in relief goods.

Its initial pledge of $200,000 (£120,000) from the government and Chinese Red Cross combined drew criticism in US media, but was also condemned by some Chinese internet users as excessive.