The month-long Ekushey Book Fair will attract hundreds of thousands of visitors.
Dhaka Metropolitan Police Commissioner Asaduzzaman Mia assured writers, publishers and attendees that ample security measures have been taken.
The commissioner also asked writers and publishers to abstain from the sale and display of books that may 'attack religious sentiments'.
"Organisers must ensure that none of the books on display and for sale attack religious sentiments. We will investigate any complaints we receive," Mia said.
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Mia justified the warning saying "the Penal Code suggested that if someone's speech or activities attack others' religious beliefs and leads to a communal clash, then he or she cannot be considered a freethinker (and) our ICT (Information and Communication Technology) Act does not permit such activities either".
All possible security measures will be taken, said Cultural Affairs Minister Asaduzzaman Noor. Anyone entering the fair will have to pass through security checks.
"Everyone will have to pass through security before entering the fair," said the minister at an inter-ministry meeting.
The fair, one of Bangladesh's keynote secular cultural events, has drawn wraths of Islamists or militants.
Bangladesh has witnessed a spate of violent attacks against secular bloggers, academics, gay rights activists, foreigners, and members of religious minorities in 2016.
Although Islamist extremist groups, including the Islamic State, claimed responsibility for most of these killings, the government blamed domestic groups.