Close to three months after the bridge collapse at CSMT, the police have arrived at three theories about the cause of the mishap. While a report by the Veermata Jijabai Technological Institute (VJTI) has said heavy corrosion caused the collapse, the D D Desai firm has blamed it on the extra load on the bridge brought on by BMC's beautification work and the chief engineer of BMC accused D D Desai for it.

The reasons were listed in the Azad Maidan police's supplementary charge sheet that was filed on Thursday, without BMC's much-awaited nod. It was filed against three accused, including two BMC officials — assistant engineer S F Kakulte, executive engineer A R Patil and retired additional chief engineer of the bridges department S Kori. The first charge sheet blamed the collapse on the lack of a bridge audit.