In the most recent incident on Aug. 20, RCMP said a 19-year-old woman was walking near Douglas Park (in the 20600 block of 51B Avenue) when a man pushed her to the ground and sexually assaulted her.
During the attack, police said the suspect took out a knife and told her not to scream. He then took her purse and iPod before fleeing on a bicycle.
Police said the suspect was wearing what looked like swimming goggles.
Investigators believe this attack may be linked to a June 22 incident when a 16-year-old girl was threatened with a knife before she was sexually assaulted in Langley.
The girl was waiting for a bus at 42nd Avenue and 204th Street, when a man drove up in what was described as a small, newer model, silver hatchback.
Police said he ordered the girl to get in his car and once she was inside, he took out a large knife. He then drove to the parking lot of a church in the 21200 block of 56 Avenue, and sexually assaulted her.
Afterwards, he drove her to the Langley bus loop at Logan and Glover where he released her.
Police said both victims worked independently with a sketch artist and investigators now believe the two incidents are linked based on similarities in both appearance of the suspect and the circumstances of the attacks.
Anyone with information is asked to contact police.