At least eight killed over last 24 hours, as death toll since protests began last month climbs to 83, activists say.

Thousands of protesters took to the streets in Nicaragua over the weekend, blocking roads as at least eight more people were killed in a 24-hour period.

Protests resumed after week-long church-mediated talks between the government and opposition to quell a month of violence broke down late on Wednesday.

Demonstrators across the Central American nation blocked highways on Saturday, demanding Ortega and his wife, Vice President Rosario Murillo, stand down.

Since protests began on April 18, at least 83 people have been killed and more than 860 wounded, according to police and rights activists.

Four people were killed on Friday, and another four by midday Saturday, police and family members said, according to AFP news agency.

Ortega, a former Sandinista rebel who first ruled between 1979 and 1990 before returning as president 11 years ago, had kept power by maintaining leftist rhetoric while ensuring an accommodation with powerful private industry and keeping up trade with the United States.

Anti-government demonstrators hold a protest demanding Nicaraguan President Daniel Ortega and his wife resign [Inti Ocon/AFP]

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But demonstrators have voiced frustration over corruption, the autocratic style of Ortega and Murillo, limited options to change the country’s politics in elections, and the president’s control over Congress, the courts, the military and the electoral board.

The protests began after the government approved cuts to pensions and social security. The plan has since been scrapped, but protests continued.

The Organization of American States (OAS) has called for Ortega to call early elections, an issue which became the biggest stumbling block in dialogue.

Foreign Minister Denis Moncada said an early ballot would mean “dismantling constitutional order and the democratically elected government.”

Before protests broke out, an OAS team had been trying to mediate in a process aimed at bringing about new elections, as well as electoral reforms.

Ortega and Murillo were elected in November 2016 for a term that ends in January 2022.