Police in Dhaka on Saturday arrested three people and another on Sunday, including a university professor, for failing to register information about tenants renting property who later attacked a cafe in the city, killing 20 people.

Gias Uddin Ahsan, a professor at North South University in Dhaka, his nephew, and the manager of Ahsan's apartment were arrested by Dhaka Metropolitan Police (DMP) for failing to comply with rules forcing landlords to register information about their tenants with the police, Mohammad Masudur Rahman, a senior police official, told Reuters.

He said police also arrested a landlord on Sunday for not disclosing information about his tenants who were also suspected of being associated with the attack earlier this month.