Mumbai's municipal corporation (BMC) said at least 75 injured people were taken to hospitals following the accident and 31 have been discharged.
The agency owning the billboard did not have a permit from the BMC to put up the hoarding, the municipal body said in a statement. The hoarding measured about 1,338 square metres (14,400 square feet), it said, bigger than an Olympic pool's 1,250 sq m and nine times more than the maximum permitted size for a hoarding.
The BMC said it has instructed the agency to remove all its hoardings immediately, Reuters reported.
About 25 people and some cars were still trapped under the crumpled hoarding, said a BMC official, who did not want to be named as he was not authorized to speak to the media.
Officials from fire services, police, disaster response and other authorities continued rescue operations that were taking longer because gas cutters could not be used at the site due to the presence of the fuel pump.
MP/PR