"We have detained a five officials of the construction company IVRCL. We are taking action against them," Kolkata Police Commissioner Rajeev Kumar said here.
Police had yesterday registered a case against the construction firm under sections 304, 308 and 407 of the IPC and sealed its local office.
Around 90 people were injured in the collapse and the condition of seven of them was stated to be "very critical".
Armymen along with Kolkata Police, disaster management team, NDRF and fire brigade personnel engaged in rescue work throughout the night, pulled out three more bodies from under the rubble of concrete, a police officer said today.
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"Nobody alive has been rescued... Two mangled autorickshaws apart from a few other vehicles have been pulled out. One lorry is still stuck inside... Whether there is anybody trapped inside cannot be certain," he said.
About a 60-metre-long stretch of the 2.2 km flyover under construction crashed down yesterday afternoon on a congested road intersection here.
A day after an official of IVRCL dubbed the flyover collapse as an "act of God", IVRCL's legal team head P Sita said, "It is an accident". She also did not rule out sabotage and referred to a media report which said there could have been a bomb blast.
"An act of God was just an expression only to describe that it is under no one's control," she told reporters in Hyderabad.
Meanwhile, a four-member police team from West Bengal reached Hyderabad during the day as part of its probe to question officials of IVRCL after the flyover it was constructing collapsed in Kolkata.