Mahmud says that the BSF has increased its use of 'non-lethal weapons', preventing the death toll from being much higher
Two general diaries (GD) were made at the Bayazid Bostami Police Station on Friday night in this connection.
BCSIR scientific officer Ashraful Kabir said calls were made to the four officials’ within an hour from the same phone number on Friday morning.
Kabir is one of those threatened.
The others are Chief Scientific Officer Habibur Rahman Bhuiyan and Nimai Chandra Nandi, and Senior Scientific Officer Nazrul Islam.