 Police are continuing their efforts to track down two offenders involved in a sexual assault in Brisbane's West End seven weeks ago. At approximately 10 30 p.m. on Friday, April 15th, a woman exited a popular nightclub on Boundary Street and began to walk towards Melbourne Street. A few minutes later the woman has first encountered the two offenders outside a prominent cafe on the corner of Boundary and Browning Street. The woman has turned into Melbourne Street and continued to walk in the direction of the Victoria Bridge. As the woman speeds up and slows down, the two offenders do the same, keeping a close pace behind the woman. Finally, the woman has been forced by the two offenders into an alley just before the Manning Street intersection. This is one of my most serious sexual offenses that I've come across in my years of police. Investigators are asking anyone who might have any information related to this incident to come forward and help solve this crime. We've had a lot of information from crime stoppers and the public in general, but this matter is still unsolved and we're still appealing to further public consistency. Crime stoppers can be contacted anonymously on 1800 333 00 or by visiting www.crimestoppers.com.au