According to MMRDA, the incident took place around 4.40 am at the MTNL junction/arm in BKC when the deck concreting work of girder was being carried out. A 65-m long and 8.5-m wide span of the girder tilted at one side during the deck concreting work. Of the 24 workers, two engineers and two supervisors carrying out the work, 14 workers sustained injuries.
The first phase of the 5.4-km SCLR extension project is estimated to cost ₹645 crore. The work on the project began in October 2016 and is expected to be completed in March 2022. Till now, around 55-60 percent of the work has been completed.