Logistical difficulties in getting aid and aid workers to earthquake stricken parts of Nepal is contributing to the delays in providing help on the ground there.

That's according to an Irish aid worker leading the response of Concern to the disaster in the country.

Nepalese officials are warning though that the slow arrival of aid could lead to the spread of disease in the country's most remote areas.

More than 7,000 people are now known to have been killed in the quake - however that figure is expected to rise significantly.

Ross O'Sullivan of Concern says the sheer scale of the disaster is creating logistical problems for the relief effort:

Rescue teams from more than 20 countries have been using sniffer dogs and thermal-imaging equipment to find survivors, but outside the capital the search is largely being carried out by police officers and the military.

It comes after Nepal was forced to partially close its only international airport because the single runway has been unable to cope with aid aircraft arriving after last month's earthquake.

Concerns have increased over the speed that aid is getting to people affected by the quake, with people complaining about a lack of temporary shelters as many sleep outside because of the fear of aftershocks causing more buildings to collapse.

The airport in Kathmandu was closed on Sunday to large aircraft, although officials still allowed smaller jets to land.

Earlier it was reported that a 101-year-old man has been pulled alive from the rubble of his home more than a week after the earthquake in Nepal,

Funchu Tamang was rescued on Saturday and is now in hospital in the Nuwakot district, north-west of Kathmandu, with only minor injuries, police official Arun Kumar Singh said.