Waterloo Regional Police are investigating three separate robberies that have occurred in Kitchener over a two day period. In each case, a knife was produced. The first incident occurred on February 22, 2017, just after midnight, as a 25-year-old man was walking in the area of Joseph Street and David Street. The victim was approached from behind by two males who demanded the victim hand over some of his personal belongings. One of the suspects was holding a knife. The first suspect is described as a white man, in his early 20s, between five feet seven inches and five feet eight inches tall. He was wearing a red hoodie with a black jacket. The second suspect is described as a white male, in his early 20s and between five feet eight inches and five feet 10 inches tall. He was wearing dark clothing with long sleeves. On February 23, 2017 at 12:55 a.m., Waterloo Regional Police were notified of a robbery that had occurred in the area of David Street and Joseph Street. In this incident, a 19-year-man was walking when he was approached by four other males who demanded he empty his pockets. The victim was stabbed multiple times and sustained non-life threatening injuries. One of the suspects in this incident is described as a white male who is about five feet tall. He was wearing a red jacket, dark pants, white runners and a dark hoodie. Shortly after this incident, a 24-year-old male was walking in the area of Charles Street and Water Street when he was approached by four men. One of the men had a knife but the victim was able to run away without being injured. The suspects in this case are described as: Suspect 1 - white male, early 20s, five feet inches tall with a thin build. He was wearing a black sweater, dark jeans and dark shoes. Suspect 2 - Asian male, five feet six inches to five feet eight inches tall, in his 20s, with an average build, short with black hair. He was wearing an olive-green jacket, light blue jeans and black shoes. Suspect 3 - White male, five feet nine inches to five feet 10 inches tall with a normal build. He was wearing dark jeans, a black winter jacket and a black or grey toque. Suspect 4 - White male, in his 20s, five feet seven inches tall with a thin build. He was wearing a red jacket and light running shoes. Waterloo Regional Police are investigating the possibility these incidents may be related. Police want to remind residents to be cautious if they are approached by anyone at night and to report any suspicious activity they may see. Anyone with information is asked to contact police at 519-650-8500 ext. 4439 or Crime Stoppers at 1-800-222-8477.