Dhaka Metropolitan Police Commissioner Asaduzzaman Mia told journalists that the instigators have been identified and their arrest was now a matter of time.
He did not elaborate for the "sake of investigation".
The July 1 terror attack at the Spanish restaurant in Dhaka's diplomatic enclave left 22 people, including 18 foreigners, dead.
Six of the gunmen were killed while one was captured alive. But he later died in a hospital.
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