Task: Translation
Input (English): They soon learned from his family and friends in Iran that Zad had been under arrest since the end of July when he was detained by the Revolutionary Guard's intelligence units.
Output (Persian): در فاصله کوتاهی و از طریق اعضای خانواده و دوستان وی مشخص شد که آرش زاد از اواخر ماه ژوئیه تحت بازداشت واحد اطلاعات سپاه پاسداران بوده است.