Dhaka, July 28 -- The Police Bureau of Investigation (PBI) has unraveled the mystery behind the deaths of two employees caused by an air conditioner explosion at the BIAM Foundation building in Dhaka's Hatirjheel area earlier this year, and arrested two persons, including an admin officer.

The arrestees are BIAM's administrative officer Zahidul Islam (38) and his associate Md. Ashraful Islam (36).

The PBI's Special Police Superintendent Abdur Rahman gave this information at a press conference held at the PBI North office in the capital, Kalyanpur, on Monday.

The PBI's Special Investigation and Operations Unit under the Organized Crime-North Division arrested the two persons on July 25 from separate locations in Kurigram and Dhaka.

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