After months of positive progress, the peace process in Colombia between the government and FARC rebels could now be on the verge of collapse. Eleven soldiers where killed in an ambush on Wednesday that appears to have breached a four-month-long ceasefire. Al Jazeera's Alessandro Rampietti reports from La Esperanza, Colombia. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter / ajenglish Find us on Facebook / aljazeera Check our website http://www.aljazeera.com/