A case has not been filed over the incident because police have not completed preparations, said local police OC Shafiqul Islam.
A man attacked Prof Iqbal during a campus event on Saturday.
The attacker, a madrasa student named Faizur Rahman, also known as Faizul, was apprehended by teachers and students. He was later taken into RAB custody.
Prof Iqbal was taken to Osmani Medical College Hospital for a surgery and then transferred to the Combined Military Hospital in Dhaka for further treatment. Doctors say he is out of danger.
“There are some weaknesses in the part of the law the university administration used to file the complaint,” Sylhet Metropolitan Police Additional Deputy Commissioner MA Wahhab told bdnews24.com. “We will file a case after we do a little more work.”
Prof Iqbal, a teacher of SUST Computer Science and Engineering Department, has repeatedly voiced his loud opposition to militancy and communalism. A police detail has been assigned to protect the popular writer in October 2016 after death threats from Islamist militants.