GARDAÍ are investigating a complaint from Bus Éireann following damage to the 207 bus in the Ballyvolane area.
Services to some of the Ballyvolane area were halted at the weekend due to stones and eggs being thrown at the buses.
Gardaí have now confirmed the issue is under investigation.
National Bus and Rail Union (NBRU) general secretary Dermot O’Leary said the service needed to be curtailed for the safety of drivers.
“Bus drivers can’t put their own lives at risk and the health and safety of the passengers.”
He said there is an ongoing campaign in the NBRU for a garda public transport division and he highlighted a clear need for increased garda resources.
A spokesperson for Bus Éireann said: “It is our experience that most anti-social behaviour occurs in city locations, from late evening onwards. Stone-throwing incidents make up most of these.
“We suspend or divert services as necessary when such incidents occur, and advise gardaí, to ensure the safety of our passengers and staff.”
Bus Éireann said its on-board CCTV is used to assist in successful prosecutions.
“The majority of our city buses have special protective screens that form part of the driver cab to protect them and all Bus Éireann road passenger fleet has CCTV cameras fitted.
“Bus drivers have two-way radio communication with staffed Automatic Vehicle Location Control Centres, along with an emergency button for contacting supervisors who will assist in any situation and decide on appropriate action regarding curtailment of services in the area. Drivers can also phone gardaí if necessary.”