DETROIT – The Detroit Police Department is investigating a triple non-fatal party bus shooting that happened Monday at around 12:45 a.m. in the 11100 block of Harper in Detroit. Police say the triple shooting took place after a verbal altercation on the party bus. According to DPD, a 21-year-old man fired shots at a 41-year-old man during the altercation. Then the victim pulled out a weapon and fired shots back at the young man. A second victim who has been described as a 34-year-old man was also shot during the incident, police say.