MUMBAI, Jan. 28 -- The Brihanmumbai Municipal Corporation (BMC) left a 400-tonne girder for the Carnac bridge dangling by the cables of a 700-tonne crane at the site on the night of January 25-26. It happened during a 6-hour block that was later extended by five hours. This could not be rectified even on the night of January 26-27, and an emergency block had to be taken on Monday night (January 27-28) between 12:30am and 4am....