[8] Momen was appointed Secretary of the Public Security Division on 18 August 2024 after the Sheikh Hasina-led Awami League government fell.
[9] He replaced Md Mokabbir Hossain who was transferred to the Ministry of Science and Technology after serving three days as Secretary of the Public Security Division.
[10] Momen sent three senior police officers, Mohammad Ali Miah, Mahbubur Rahman, and Joydeb Kumar Bhadra, into forced retirement.
[11] In September, he sent sent nine more police officers, AKM Hafiz Akhtar, Bashir Ahmed, Devdas Bhattacharya, Khandker Lutful Kabir, Mir Rezaul Alam, Imam Hossain, Mizanur Rahman, Chowdhury Manjurul Kabir, Dadon Fakir, Shamim or Rashid Talukder, and Rafiqul Islam, into forced retirement.
[13] He sent three more police officers, Harun Ur Rashid, Shahabuddin Khan, and Kh Mahid Uddin, into forced retirement in October.