Honduran authorities said they have arrested an energy company executive allegedly behind the high-profile 2016 murder of prominent environmental activist Berta Caceres.

Police detained electrical engineer Roberto David Castillo Mejia "as the intellectual perpetrator" behind Caceres's murder, the prosecutor's office said in a statement Friday.

Officials said Castillo had served as CEO of the company Desarrollos Energeticos (DESA) - which Caceres actively campaigned against over plans to build a hydroelectric dam - at the time of the activist's slaying.

He was "responsible for providing logistics and other resources to the perpetrators," the statement said.

Caceres opposed DESA's plans to construct the dam across a river on which indigenous communities depended.#