A 16-year-old was sexually assaulted on a bus while travelling into the city centre.
The offender, an Asian man between 30 and 35 years old, sat next to the teenager on the number 5 Arriva Bus on Saturday, June 6.
Between 1.40pm and 2.05pm he sexually assaulted her over her clothing between Heelands and CMK before getting off the bus at K3 in the centre.
Two women approached the victim to see if she was ok, as she was visibly upset.
Officers would like to speak to these two women as they may have information which would help with the investigation.
Police would also like to speak to anyone else who may have seen the incident.
The offender is Asian 5ft 5ins, with medium length black hair, facial stubble and a small goatee beard.
If you have any information contact 101.