Rights activist Sultana Kamal filed the GD on Saturday, Dhanmondi Police Station OC Abdul Latif told bdnews24.com.
The two others, who had received ‘death threat’, are Dhaka University’s history Professor Muntasir Mamun and Ekattorer Ghatak Dalal Nirmul Committee chief Shahriar Kabir.
A militant group called ‘Lone Wolf’ in its publication detailed possible ways to kill the three, OC Laatf said, citing the GD.
Prof Mamun told bdnews24.com he was out of Dhaka and would also file a GD seeking security after returning home on Sunday.
Shhriar Kabir said he had already written to Inspector General of Police Mohammad Javed Patwary seeking security for Kamal and Mamun.
The ‘death threat’ published by the militant group was being circulated on social media, Kabir said.
“This is an alarming issue. The government really has no control over social media,” he added.