PHNOM PENH (Reuters) - The Cambodian capital was calm on Tuesday as the ruling party claimed election success and opposition leaders threatened to protest against what they said was an unfair vote. Some people said they were happy the ruling Cambodian People‘s Party (CPP) of government leader Hun Sen, which has ruled for 18 years, looked certain of victory after Sunday‘s vote, while opposition supporters said they were surprised. Election officials said at least 90 percent of the country‘s more than 5.3 million eligible voters turned out for Sunday‘s general election. Official preliminary results are due out on Saturday, but a senior CPP official said on Tuesday party projections showed it winning 65 to 67 of the 122 National Assembly seats. Opposition leader Prince Norodom Ranariddh‘s FUNCINPEC party was seen winning 42 to 45 seats while the opposition Sam Rainsy Party was seen taking 13, according to the CPP estimates. Former First Prime Minister Ranariddh, who was ousted by his junior co-premier Hun Sen last year, and opposition ally Sam Rainsy said on Tuesday their apparent defeat was due to fraud and they would boycott the new parliament and organise protests. Some opposition party voters in the capital, where support for the opposition is seen as stronger than in many rural areas, were despondent over their parties‘ defeat. FUNCINPEC won most seats in the last poll in 1993 organised by the United Nations, finishing with 58 of the then 120 seats. But Ranariddh agreed to the power-sharing coalition after Hun Sen objected to the result and the country faced renewed strife. Their unwieldy coalition acollapsed in violence last July when Hun Sen ordered his forces to move against Ranariddh‘s military facilities in the capital. The city was rocked by two days of battles and a third of looting, in which scores of people were killed and hundreds wounded. Campaigning was generally smooth but memories of last year‘s violence remained fresh in people‘s minds.