The Detective Branch (DB) of Dhaka district police arrested Abdur Razzak, the engineer of Rana Plaza, on Thursday.
He was arrested from his residence in Savar. Sahin Parvez, an inspector of DB police, said the construction of Rana Plaza was under the supervision of Razzak from the beginning.
The engineer acknowledged the crack in the building to different media when it was found on April 23. He was arrested as part of DB investigations, DB officials said.
Rana Plaza, situated near Savar bus stop, collapsed on April 24 leaving at least 442 dead and several hundred injured.