Caracas shake-up could intensify violence in Catatumbo in Colombia, an area rich with coca crops, cocaine laboratories and a porous border with Venezuela

Alberto’s eyes shifted nervously. His chin trembled.

His slender hands fumbled with a manila folder containing his family’s documents, which he was waiting to present to staff of the Human Rights Ombudsman in the north-eastern Colombian city of Cúcuta, in the hope of receiving humanitarian aid.