KATHMANDU, Feb 18 (Reuters) - The first phase of disarming Nepal's Maoists and registering combatants housed in camps in the Himalayan nation is over, the United Nations said on Sunday, a key step in a peace deal that ended a deadly civil war.

"We are just finalising a report that will go to the government and Maoists in a day or so," Kieran Dwyer, a spokesman for the United Nations in Nepal, told Reuters.

The report will give details of the number of Maoist combatants as well as the number and types of weapons they produced for registration, Dwyer said, without further details.

In the past, Maoists have said they have 35,000 fighters but have not provided details of their arms.

Last month, U.S. Ambassador James Moriarty said the former rebels were buying inferior arms in neighbouring India to store in U.N. containers and were retaining their modern weapons, a claim the Maoists and the government reject.

The Maoists and multi-party government mandated the UN to monitor Maoist fighters and their arms as part of the November peace deal that put an end to the anti-monarchy Maoist revolt that started in 1996 and claimed more than 13,000 lives.

Maoist arms have been catalogued, bar-coded by registration teams and stored on racks inside metal containers. Maoists will keep the keys but U.N. teams will provide a 24-hour watch.

The landmark peace deal has seen the Maoists take 83 seats in the 329-member provisional parliament and they are also set to join an interim administration.

Dwyer said the second stage of arms monitoring, which includes verification of information about the age and number of years combatants had served in the Maoist force, would start soon.

Human rights group accuse the Maoists of recruiting children in their ranks, which the former rebels deny.

In the final phase of disarmament, the Nepal Army will also store an equal number of arms ahead of this year's elections for a constituent assembly that will draw up a new constitution and decide the fate of the monarchy -- which the Maoists want abolished.

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