The National Investigation Agency has announced a cash reward of Rs 25 lakh for any information leading to the arrest of fugitive underworld don Dawood Ibrahim, a key accused in the 1993 Mumbai serial blasts, an official said on Thursday. The probe agency has also announced a cash reward of Rs 20 lakh on Ibrahim's close aide Shakeel Shaikh alias Chhota Shakeel, and Rs 15 lakh each on associates Haji Anees alias Anees Ibrahim Shaikh, Javed Patel alias Javed Chikna and Ibrahim Mushtaq Abdul Razzak Memon alias Tiger Memon, he said. All of them are wanted accused in the case of 1993 Mumbai serial bomb blasts.