TUNIS, April 10 (Reuters) - Stone-throwing demonstrators protesting against rising living costs and unemployment have clashed with police in Tunisia's central town of Redeyef over the past three days, trade union sources said on Thursday.

Violent protests are rare in the North African country of 10 million where the government of President Zine al Abidine Ben Ali, who has been in power since 1987, shows little tolerance of dissent.