Prof Abul Kashem Fazlul Haque feared for his son when he heard of the attack on Avijit Roy's publisher Ahmedur Rashid Tutul.

His heart was racing the next moment when he could not reach his son Faisal Arefin Dipan on phone. "I could not reach his phone," he told reporters today. "I heard that a publisher who published Avijit's books was attacked."

"I called to know whether my son is okay. He also published some books of Avijit Roy. I could not reach him. Then I spoke to his wife. She told me to come here and see my son," he said.

A former Bangla department professor at Dhaka University, Fazlul Haque was speaking to the media at the place where his son, proprietor of Jagriti publishing house, Faisal Arefin Dipan was knifed to death.

Dipan's body was found lying in a pool of blood inside the office of Jagriti publishing house on the third floor of Aziz market.

The attack was similar in manner to attack on Shuddhwashawr owner Tutul and two bloggers Tareque Rahim and Ranadipam Basu in Lalmatia.