Upon planning for a trip through Chile, Bolivia and Peru, I have encountered several personal accounts of (armed) robberies of overland buses between tourist destinations, especially in Bolivia and Peru.
Since long-distance buses are the most available kind of transportation there, many tourists probably end up taking such a bus.
How likely is it to be to be the victim in such a robbery (i.e. does this happen once a year or is this a more regular occurrence)?
What planning can I do beforehand to reduce the risk of getting into such a situation in the first place?
If I do find myself in this situation, how should I behave?