Gardaí have confirmed that they are investigating an incident in which a six-year-old boy is said to have been pricked by a syringe on a Dublin Bus.

The incident occurred on the 66B bus last Friday evening close to the Liffey Valley Shopping Centre on the N4.

Emergency services attended the scene and the boy was taken to Tallaght Hospital where he underwent a series of tests.

Gardaí say his injuries were not life threatening.

Gardaí at Ronanstown are investigating and are liaising with Dublin Bus on the matter.

A garda spokesperson said part of the investigation will be to ascertain whether or not it was a used syringe.

In a statement, Dublin Bus has said the incident is under internal investigation and said it was has very strict protocols in place which the driver followed.

The company also said incidents of this nature are a rare occurrence and the overall level of anti-social behaviour is low and has decreased over the past number of years.