A woman has been pulled from the earthquake rubble in Kathmandu just hours after a 15-year-old boy was also rescued alive after spending five days trapped under a collapsed building.

Cheers rang out in Nepal's capital as rescuers pulled Pemba Tamang, dazed and dusty, from the rubble and carried him away on a stretcher.

He had been trapped under the remains of a seven-storey building in Kathmandu since Saturday, when the magnitude-7.8 earthquake struck.

It came as the official death toll rose to 5,844, with 11,175 people injured and more than 100 UK nationals reunited with their loved one at Stansted Airport flying home from Nepal.

Hemchandra Rai, 42, a dual British national and married father of three who who lived in Hong Kong, was named as a British victim.

Nepalese rescuers, supported by an American disaster response team, had been working for hours to free him. LB Basnet, one of the police officers who helped rescue Pemba, said he was surprisingly responsive.

"He thanked me when I first approached him," said Mr Basnet. "He told me his name, his address, and I gave him some water. I assured him we were near to him."

When Pemba was lifted out, his face was covered in dust and medics had put an IV drip into his arm. A blue brace had been placed around his neck. He appeared stunned, and his eyes blinked in the sunlight as workers hurriedly carried him away.

Pemba said he was working in a hotel in the building when it began to shake.

"Suddenly the building fell down," he said. "I thought I was about to die."

All he had to eat while he was trapped was some clarified butter, he said.

Police in the city said a woman in her 20s, Krishna Devi Khadka, was rescued from rubble in another location. She had been trapped in an area near Kathmandu's main bus terminal where there are lots of hotels.

The jubilant scenes were welcome on a drizzly, chilly day in Kathmandu where many residents remained on edge over aftershocks that have rattled the city since Saturday's mammoth quake killed more than 5,900 people and destroyed thousands of houses and other buildings.

More than 70 aftershocks stronger than magnitude 3.2 have been recorded in the Himalayan region by Indian scientists over the past five days, according to JL Gautam, the director of seismology at the Indian Meteorological Department in New Delhi. The strongest, registering magnitude 6.9, came on Sunday, he said.

Rattled by the shaking and anxious to check on family members in outlying areas, tens of thousands of people have left the capital on buses this week. The government has been providing free bus services to many destinations.

"I have to get home. It has already been so many days," said Shanti Kumari, with her seven-year-old daughter, who was desperate to see family in her home village in eastern Nepal.

International Development Secretary Justine Greening said the UK Government is providing £2.5 million, including RAF Chinook helicopters, to the UN's Humanitarian Air Service, which will increase helicopter capacity, enabling aid supplies to be taken to more isolated areas.

"Conditions in Nepal are dire, but the UK is determined to do everything it can to help support Nepal and its people," she said.

The RAF helicopters will travel to Nepal in the next few days.

the sister of a yoga student stranded in Nepal has criticised the embassy's response to her plight as "useless".

At Stansted, rescued Britons told of their stories. Susannah Ross, 20, was trapped in the remote Bamboo Village in Langtang National Park for five days with a group of trekkers.

Miss Ross, from Bath, Somerset, was finally evacuated by a helicopter and then taken to a military base at Dhunche, to the north of Kathmandu.

Her sister, Nina Ross, 25, said: "I haven't heard anything to say that she has been in contact with the British embassy or the Foreign Office.

"When I last talked to them, again, they were as useless as ever."

Some spoke of their lucky escapes and said they had seen many people, mainly locals, who had suffered far worse.

Roger Strachan, 19, from York, who had been in Nepal working as a voluntary teacher, said: "We must remember there are thousands of Nepalese people living in very squalid shelters even at this moment and in a much more threatened position than we were in."

Meanwhile, expeditions to the summit of Mount Everest could resume if climbers decide to go ahead, government and trekking officials in Nepal said. The Foreign Office is still investigation reports that a British national died on Mount Everest.