Cambodia's ruling party said it had won a landslide in Sunday's one-horse election, an expected outcome after the main opposition was banned, paving the way for leader Hun Sen to prolong his 33 years in power.

Hun Sen, who came to power in 1985 in a country still plagued by civil war, has cracked down on dissent in the run-up to this year's poll, pressuring civil society, independent media and political opponents.