So more arms caches have been discovered or disclosed in the South? What does that prove? Insofar as it was easier doing things on one side of the border and one side of the water rather than the other, that's presumably where they'd be done, but that's just operational details.

The point is, it's perfectly possible to carry on illegal and terrorist activity within the territory of the enemy and without a safe base elsewhere. And it reduces the problems involved in bringing explosives or personnel across borders, or across oceans.

One of the main points of having a cell structure in a terrorist organisation is that it makes it possible to carry on autonomously if need be. And that can have disastrous consequences for the victims.