At least 15 commuters were killed in a stampede on a railway footover bridge near the Parel-Elphinstone Road stations here on Friday, a BMC official said.
At least 24 others were injured and six are critical, the Brihanmumbai Municipal Corporation Disaster Control official said.
The victims were taken to the nearby KEM Hospital in Parel. Top police and railway officials have rushed to the spot.
The cause of the stampede on the narrow footover bridge was not known, but eyewitnesses claimed that a sudden rumour of a suspected electrical short-circuit sparked off a panic.
As the rescue teams arrived, local cab drivers and workers helped shift the injured.