The imprisonment without trial of Palestinian activist Faisal Husseini was approved by a Jerusalem district court judge Sunday.
Husseini, jailed three months ago, is serving his fourth term under administrative detention.
He has never been formally charged or brought to trial, but is being held under the emergency regulations of the British Mandate, which Israel retained.
Husseini, 48, heads the Institute of Arab Studies in East Jerusalem, which the Israeli authorities ordered closed for a year when he was arrested.
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