Nepal has held memorial services to mark the first anniversary of an earthquake that killed nearly 9,000 people and left hundreds of thousands homeless.

People gathered at the remains of a historic tower in Nepal's capital Kathmandu that collapsed in the devastating earthquake.

Minor protests were also held, with demonstrators angry at the slow rate of reconstruction in the wake of the magnitude-7.8 quake that ravaged vast areas of the country.

Prime minister Khadga Prasad Oli laid a wreath at the ruins of the Dharahara tower in the heart of Kathmandu. The iconic structure collapsed in the April 25 2015, quake, killing 132 people. In all, 8,856 people died in the disaster.

Participating in the memorial ceremonies were people who lost loved ones in the quake, and others who simply came to pray for those killed.

"I lost a friend who was working at the top of the tower on that day. I hope he and others are in a good place," said Ram Shrestha, pointing at the remains of the tower.

He said that he had just stepped out a few minutes before the earthquake struck to go shopping.

Madhav Newpane, who runs a shop near the tower, witnessed its collapse. He returned on Sunday with a bouquet of flowers and candles.

"There were many people killed here on that day. I will never be able to forget that day," Mr Newpane said.

About 100 protesters scuffled with riot police outside the prime minister's office, demonstrating against the slow reconstruction of the homes.

More than 600,000 homes were destroyed and around 185,000 damaged in the quake.

"Government, where is reconstruction. Open the gates of the government," the protesters chanted as they tried to force their way through a police barricade.

The International Federation of Red Cross and Red Crescent Societies said an estimated four million people are still living in sub-standard temporary shelters in conditions that pose a threat to their health and well-being.

Only 661 families have received the first instalment of a 200,000-rupee government grant, getting 50,000 rupees so far.

Nepal has made almost no progress in rebuilding from the quake despite foreign donors pledging more than $4 billion in aid during a donor's conference last year.

The government, in disarray for nearly a decade, has not regrouped enough to be a strong force for reconstruction.

Out of the $4.1 billion pledged, Nepal has so far received just $1.28 billion.

The delay in getting the money has been blamed on the government taking months to set up the National Reconstruction Authority, which was done only in December.

Finance minister Bishnu Prasad Paudel said the delay occurred because it was necessary to conduct a detailed survey of the damaged houses before reconstruction could begin.

"Nepal had signed a written commitment in black and white that there would not be any reconstruction without the detailed beneficiary survey during the donor's meeting," Mr Paudel said earlier.

"But until the detailed beneficiary survey was completed, there was no way we could go ahead with the actual reconstruction."

Now that the work is completed in 11 of the 14 districts affected by the earthquake, work will proceed at full speed, Mr Paudel said.

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