The Paleostinians have a long record of terrorism in and outside of Israel, remember, one even shot Robert Kennedy to death.
Spanish police detain Palestinian man linked to ISIS on island of Gran Canaria
He had already tried once to get into Syria to fight with the rebel forces but was turned away at the Turkish border.
He returned to Spain, setting up home in the town of Vecindario, half way between the popular Playa del Inglés and Gran Canaria airport.
But unknown to him, police kept him under surveillance since 2014 and swooped at Madrid airport when he made a second attempt to join jihadists in Syria.
There is no suggestion that there was any plot for a local attack but officers are trying to identify any other collaborators who might have helped the Palestinian to achieve his aims.