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.