He lived under the rafters in a small attic apartment in the Molenbeek district of Brussels, and became known to some followers as the Santa Claus of jihad. He had the bushy beard and potbelly, and generously offered money and advice to young Muslims eager to fight in Syria and Somalia, or to wreak havoc in Europe.<\/p>\n
When the Belgian police seized the computer of the man, Khalid Zerkani, in 2014, they found a trove of extremist literature, including tracts titled \u201cThirty-Eight Ways to Participate in Jihad\u201d\u009d and \u201cSixteen Indispensable Objects to Own Before Going to Syria.\u201d\u009d In July, Belgian judges sentenced him to 12 years in prison for participating in the activities of a terrorist organization, and declared him the \u201carchetype of a seditious mentor\u201d\u009d who spread \u201cextremist ideas among na\u00c3\u00afve, fragile and agitated youth.\u201d\u009d<\/p>\n
But only in the months since then has the full scale of Mr. Zerkani\u2019s diligent work on the streets of Molenbeek and beyond become clear, as the network he helped nurture has emerged as a central element in attacks in both Paris and Brussels \u201d\u201d as well as one in France that the authorities said last month they had foiled.<\/p>\n