Police filed an unnatural death case over Tuesday's explosion at a Siddikbazar building in Dhaka's Gulistan that left at least 20 persons dead.

Kamrul Hasan Kamal, inspector (investigation) of Bangshal Police Station, confirmed the matter to The Daily Star last night.

He said an unnatural death case was filed and different agencies are investigating the incident.

"We will take further legal steps if we discover something new during the investigation," he said.

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Death toll rises to 20 in Gulistan blast