Commuters in Nottingham have expressed concern about a local bus service after a concrete slab was thrown through a window. The slab was thrown through the window of a number 48 bus in Clifton last week.
Three people were injured when the glass shattered.
It is believed the slab was thrown by youths taking shelter behind bushes at the entrance to the Nobel Road estate.
Passengers have expressed fears about further attacks and called for improved policing in the area.
Nottingham City Transport, local councillors and police are in discussions about the issue.