The seven attacked a 17-year-old boy and a 26-year-old man on the platform in the 4600 block of North Kedzie Avenue at 12:35 a.m. Monday after asking them to flash gang signs, police said.



The two refused, saying they were not in a gang, and Mario Elvira, 18, pulled out a machete and struck the 26-year-old in the head, cutting his head and neck, police said.