[3] He was accused in more than 19 cases relating to extortion, corruption, illegal arms possession, and tax evasion.
He accumulated even more money during the next BNP government from 2001 to 2006 due to his close relations with Tarique Rahman and his brain.
He earned hundred of crores of taka by selling concrete poles to the Rural Electrification Board via his business firm Khamba Ltd.[6] Mamun was arrested by the police in 2006 during the 2006–08 Bangladeshi political crisis on an illegal arms case.
Mamun was prosecuted by the Bangladesh Anti Corruption Commission (ACC) for acquiring Tk.
[1] In 2008, a court in Dhaka ordered a 10-year prison term for Mamun and 3 years for his wife, Shahina Yasmin, after the charges were proven.
[12] In July 2016, the High Court reduced Mamun's fine to Tk 200 million.
[4] Mamun received bail on 6 August 2024 after the fall of former Prime Minister Sheikh Hasina.