DETECTIVES from the Sex Crimes Squad have released images of three males who they believe may be able to assist with their investigation into the sexual assault of a 14-year-old girl in Doonside last month.

The girl was allegedly sexually assaulted by a number of males in Bill Colbourne Reserve around 11pm on Saturday 8 February 2014.

On Thursday 13 February 2014, a male presented himself to Blacktown Police Station where he was subsequently charged with sexual assault.

On Friday 21 February 2014, the same male was charged with an additional offence — aggravated sexual assault.

He has been granted strict conditional bail and is next due to appear in court on Thursday 17 April 2014.

Strike Force Tompo, comprising detectives from the Sex Crimes Squad and investigators from Blacktown Local Area Command, is continuing to investigate the alleged sexual assault and officers have now released CCTV images of three males who they believe may be able to assist with police inquiries.

The images were captured at Blacktown Railway Station and Parramatta Railway Station on the night of Saturday 8 February 2014.

The first male in the images is described as being aged in his late teens or early twenties and of African appearance. In the image, he appears to be wearing a white-and-black-patterned jumper, and a hat or bandana on his head. This image was captured by CCTV at Blacktown Railway Station.

The second male is described as being aged in his late teens or early twenties and of African appearance. In the image, he is wearing a white and blue, long-sleeved shirt. This image was captured by CCTV at Parramatta Railway Station.

The third male is described as being aged in his late teens or early twenties and of African appearance. In the image, he appears to be wearing a light blue, long-sleeved shirt. This image was captured by CCTV at Parramatta Railway Station.

Police are urging anyone with information about this incident to call Crime Stoppers on 1800 333 000.