Waterloo Regional Police were called to Claudette Millar Hall, located at 165 University Avenue West, around 8:45 p.m. They said one man stabbed another inside the student residence. An 18-year-old man was taken to hospital with non-life-threatening injuries. Police said the 19-year-old was located a short time later by University of Waterloo Special Constables and arrested. He is charged with aggravated assault and possession of a weapon for a dangerous purpose.