Voters rejected the deal struck between the government and the FARC rebels.
Opponents of the pact believed it was too soft on the rebels by allowing them to re-enter society, form a political party and escape traditional jail sentences.
If the terrorists are weak and their end goal is political, not apocalyptic, a peace deal may be within reach.
Plan Colombia, a U.S. military and aid initiative, helped Colombia gain the upper hand against the FARC rebels. The initiative, however, was far from perfect.
After decades at war, Colombia's FARC fighters may soon face a new struggle: returning to normal life.
Here's what to know about Colombia's historic peace deal referendum.