After finding refuge and building power in Venezuela, a decades-old rebel group has waged the worst violence in Colombia in a generation, setting off troubling regional tensions.

The discovery of Ronald Ojeda’s body encased in concrete in Chile has raised new fears over how far President Nicolás Maduro will go to keep his stranglehold on Venezuela.

Clashes between armed groups in Colombia have led to some of the worst violence in the country in years.

The United States will also extend temporary protections for roughly 600,000 Venezuelan migrants in the United States.

President Nicolás Maduro was sworn in for another six years on Friday, after claiming to win an election in July that many inside and outside Venezuela say he lost decisively.