Assistant Grain Purchasing Officer in the Civil Supplies Department, K. Obul Reddy, was trapped on Wednesday by the ACB sleuths as the official was accepting Rs.50,000. DSP (ACB) Narasimha Rao said Mr. Reddy had demanded a bribe of Rs.70,000 from M. Rama Sundara Rao, a retail rice merchant at Mangalagiri, to skip checking his shop.