Tareque Rahman, the eldest son and heir apparent of two times former Bangladeshi premier Khaleda Zia, was partially paralysed when tortured in custody, doctors said Sunday. Tareque was strung up blindfolded in a dark room, then dropped down and struck against a wall, fracturing two bones in his back, Kazi Mazharul Islam, the doctor who treated him quoted from his medical report. Rahman was partially paralysed by the impact of the fall, which has resulted in "gradual wasting of his right lower limbs," he said. Rahman, who is joint secretary of the Bangladesh Nationalist Party (BNP), has been detained since March last year on graft charges after the government launched an anti-corruption crackdown.