They may have had an informant. The "hiker that found the weapons" may be a cover story.
Hopefully the find will disrupt the attack teams and cause them to abort their missions. Security teams must keep searching for weapons caches and safe houses.
Many plans are made. Most are never executed.
“Many plans are made. Most are never executed. “
This MO is a little like what police found when Trump came to speak at Western Conservative Summit in Denver. Bricks to use as weapons were being stashed in dumpsters all over downtown, presumably to be used against all those conservatives conveniently in one spot. The dumpsters were marked.
Police decoded the marks, located all of them, and made it impossible for the bad guys to use the bricks.