"Loopholes in U.N. Security Council sanctions procedures are allowing blacklisted al Qaeda and Islamic State terrorists and their supporters to tap their bank accounts despite a U.N. asset freeze, according to documents reviewed by The Wall Street Journal and people familiar with the matter. Those gaining access to their funds include Khalifa al-Subaiy, a Qatari financier who the U.S. says long provided financial support to senior al Qaeda leadership, including Sept. 11 mastermind Khalid Sheikh Mohammed. 'I would be hard-pressed to find someone more prominent than him in the whole terrorism financing side,' said Hans-Jakob Schindler, a senior director at the Counter Extremism Project and former adviser to the U.N. Security Council."