Nobody is responsible for her death, the woman wrote on Facebook
The arrests were made late on Tuesday from Kachuparha Shalban area during a 'secret meeting', said Superintendent of Police Harun or Rashid.
"A special task force conducted a raid around 11pm on a tip-off of the meeting," he said.
The five have been identified as Tanvirul Haq Shijul, 23, from Bogra and Harun Miah,37, Md Hossain, 29, Din Islam,35, and Abdul Hannan, 35. All of them are from Kishoreganj.
Police said it seized 11 bombs, three sharp weapons, jihadi literatures and two flags during the raid.