Bolivian President Evo Morales denounced what he called a coup by violent groups on Saturday, as some police officers joined opposition protests amid a weeks-long standoff over a disputed election.

Axar.az reports citing Reuters.

Morales, Latin America’s longest-standing leader, won the election on Oct. 20 but the vote count had been inexplicably halted for nearly a day, sparking allegations of fraud and leading to protests, strikes and road blocks.

“Sisters and brothers, our democracy is at risk due to the coup d’etat that violent groups have launched that undermine the constitutional order. We denounce this attempt against the rule of law before the international community,” Morales tweeted in the early hours of Saturday.

Luis Fernando Camacho, a civic leader from the eastern city of Santa Cruz who has become a symbol of the opposition, replied to Morales’ tweet, saying “We have not come to overthrow a president, we have come to free Bolivia from its dictatorship”.

Camacho plans to lead a march to the government palace on Monday with a symbolic pre-written resignation letter for Morales to sign.

Bolivians marched again in several cities on Friday night and there were scattered cases of police joining the protests, adding to the pressure on Morales.

In the city of Cochabamba , the scene of recent violent clashes, Reuters witnesses saw police officers protesting on the roof of their headquarters in an apparent act of disobedience against the government.

The foreign ministry said in a statement on Saturday the police officers had “abandoned their constitutional role of ensuring the security of society and state institutions.”