Four people were killed after they were hit by a BEST bus while it was reversing in Mumbai tonight. Nine others were injured. The incident happened in Mumbai's Bhandup.The injured people have been admitted to a hospital. BEST, short for Brihanmumbai Electric Supply and Transport, runs the country's largest public bus fleet.The Mumbai Police said the bus lost control before it hit pedestrians. What led to the bus going out of control is not yet known. Soon after the accident, a large police presence was deployed at the site to manage the situation and regulate traffic in the area.