Arrested Tafshirul Islam, who threatened BSMMU doctor Prof SM Mostofa Zaman, is an active Shibir member, Rapid Action Battalion (RAB) has said.

Tafshirul's father Rafiqul Islam Rofi also an active member of Jamaat-e-Islami. Rofi is an accused in number of cases and also served jail term.

Tashfirul threatened the physician from his personal anger.

RAB Legal and Media Wing Director Commander Khandaker Al Moin disclosed the information in a press briefing on Thursday after arrested Tashfirul from Jhenidah's Moheshpur upazila on Wednesday night.

He said, "Sayeedi's family expressed satisfaction with his treatment. But those will be brought to the brook, who are threatening Dr Mostofa Zaman. RAB is working to bring the culprits."

War crime convict Delawar Hossain Sayedee was admitted to the Bangabandhu Sheikh Mujib Medical University (BSMMU) hospital on August 13 after he fell sick. He breathed his last around 8:40pm on August 14 under cardiology department chairman Prof Chowdhury Meshkat Ahmed. Prof SM Mostofa Zaman was also the members of Sayeedi's medical board.

After the death of the Jamaat leader, physician Mostofa Zaman has received death threats from certain individuals on his messenger. Later on Tuesday night, he filed a general diary (GD) with Dhanmondi Police Station.