VOICED : Arrestan a opositor venezolano al volver del exilio

Oto Pérez accuses the US of political interference, claiming his detention is due to US pressure. He sent a letter to Rafael Correa, interim president of CELAC, denouncing human rights violations and requesting an investigation. Pérez suggests his situation is a US retaliation through CICIG for not accepting certain US policies. After resigning on September 2, Pérez is detained in a military barrack in Guatemala City, under investigation for leading a customs fraud network. The case was revealed on April 16 by the Guatemalan Prosecutor's Office and CICIG, a unique UN-backed body aiding in justice system reform.

What role does the CICIG play in Pérez's situation?

What is the nature of the investigation against Pérez?