Benedictine: The ELN is capable of combusting at any time and without warning. The guerrilla and the Government of Colombia had agreed in recent weeks to extend the ceasefire for another 180 days.

The parties agreed to create a mechanism for society to participate in the process, he says. Benedictine: This is the first major crisis faced by Vera Grabe, the 72-year-old anthropologist whom Petro has put in charge of the negotiations. He says Grabe will have to overcome this new crisis to complete a process that is moving too slowly.