Abdelhamid Abaaoud, suspected planner of the Paris attacks, mocked European frontier controls and boasted of the ease with which he could move between Syria to his Belgian homeland and the rest of Europe. As police piece together how militants mounted Friday's assaults, evidence that some involved had fought in Syria and were on wanted lists, yet slipped back to kill 129 people, will raise a host of questions on how Europe tracks local Islamists and controls the borders it has opened to half a million Syrian refugees. Abaaoud, a 28-year-old of Moroccan origin, was the best known of more than 350 Belgians to fight in Syria -- proportionately the biggest contingent from Europe -- and in...
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