At 7:40 p.m. police responded to a report of an injured man in the parking lot of the Dartmouth Sportsplex. An argument ensued between a man and a male youth on a bus at that location. After both exited the bus, an assault ensued between the two people resulting in the man being knocked to the ground. The man was transported to the hospital with what at this time is believed to be serious injuries. An 18-year-old male has been arrested for assault causing bodily harm as well as breach of a court order.