but they discovered nothing of the charlie hebdo plot.urveillance resources were already stretched, and the number of european extremists was about to surge. (explosion) >> narrator: in 2012, the war in syria dramatically changed the european security landscape. (shouting) it spawned a new jihadist movement, isis, which set out to be even more brutal than al qaeda. in 2014, the group formally split from al qaeda and declared a caliphate, or islamic state, and summoned all muslims to join them. (speaking spanish) >> (translated): and the effect of that call is brutal. it's... well, extraordinary. our investigations multiplied extraordinarily. >> narrator: dolores delgado is the chief counterterror prosecutor of spain's high court. as spain's liaison to france and belgium, she worked closely with her european counterparts to monitor the exploding numbers of isis recruits. >> (translated): there was a call for young people, a call for women, a call for children, and it's not to travel to the sahel, or waziristan. it's to go to syria. and syr