A BEST bus driver, Santosh Sawant, has been arrested in Mumbai after an accident killed four people and injured eight others. Sawant claims the previous driver left the electric bus in 'drive' mode instead of 'neutral,' causing the vehicle to surge forward when he started his shift. Police are investigating the incident, including eyewitness accounts, CCTV footage, and the bus's mechanical condition, and plan to question the previous driver. Sawant has been remanded to police custody.