M Sanaul Hoque, coordinator of the investigation agency, disclosed the information at a press briefing in Dhanmondi in Dhaka on Wednesday morning, reports UNB.
The investigation agency finalised four specific charges against the accused that include murder, rape, arson attacks and forcing the people to leave the country, Hoque said.
The six suspected war criminals are: M Abdur Jabbar Mandal, 86; M Jasijar Rahman, alias Khoka, 64; M Abdul Wahed Mandal, 62; M Montaj Ali Bepari, alias Montaj, 68; M Ajgar Hossain Khan, 66; and M Ranju Miah, 59.
On October 12, 2015, the ICT investigators started the investigation against the six, who are all residents of Gaibandha Sadar upazila.
Of them, police arrested Ranju Miah on May 26, while the five others are on the run.