The London Transit Commission says 16 more bus shelters have been damaged between Wednesday night and Thursday afternoon.
That brings the total number that have seen panes of glass shattered to more than 30 this week.
Most of the damaged shelters are in the White Oaks area and west end London.
Kelly Paleczny, LTC general manager, says overnight damage to at least three shelters is believed to have been caused by a pellet gun, and police have recovered pellets at the scene.
It costs $250 to replace each pane of glass, and Paleczny says many shelters have had more than one pane broken.
LTC crews are currently trying to get to each shelter to clean up the debris, and then contractors will begin replacing the glass.
Anyone with information on these incidents is urged to call London police or Crime Stoppers.
