The incident took place on Knowsley Street, Bolton, at around 6.30pm. A Greater Manchester Police spokesperson said: "We are investigating an assault which took place in Bolton town centre on Monday, August 3. "Prior to the assault, police had received reports relating to inappropriate comments made towards a teenage girl and the alleged offering of cannabis to young people. The assault took place when a group of youths following the male into McDonalds. However, it is alleged that the attack was retribution for 'inappropriate comments' made towards a teenage girl.