Six people, including four teenage girls — the youngest of them 12 — were shot during a mass shooting on the West Side late Saturday.

       Less than two hours later, an 8-year-old boy was shot in an unrelated shooting that left two people wounded, according to Chicago police.

       Six people who had been attending a party were shot around 11:40 p.m. in the 5000 block of West Ohio Street in South Austin, according to a police media notification. They had been standing on a sidewalk in a group when “occupants in a dark-colored SUV fired shots” into the crowd, police said.

       Among the injured:

       A 15-year-old girl suffered a graze wound to the head and a gunshot wound in her buttocks and she was taken to Mount Sinai in fair condition. A woman, 19, suffered a gunshot wound to the back and she was taken to Stroger Hospital in fair condition. A 13-year-old suffered a gunshot wound to the buttocks and she was taken to Stroger Hospital in fair condition. A 14-year-old suffered a gunshot wound to the buttocks and she was taken to Stroger Hospital in fair condition. A 12-year-old suffered a gunshot wound to the hand, and she was taken by family members to West Suburban Medical Center in Oak Par, where she was listed in fair condition. A man, 25, arrived at Mount Sinai Hospital with a gunshot wound to the buttocks. He was treated and released, police said.

       In an unrelated shooting about 1:05 a.m., an 8-year-old boy was one of two people shot in the 2000 block of West 83rd Street in the Gresham neighborhood, police said.

       The child was in a moving vehicle with a 28-year-old man when someone in a black SUV opened fire, shooting at their vehicle. The man was taken to Advocate Christ Medical Center in Oak Lawn with a gunshot wound to the back and he was treated and released, police said.

       The 8-year-old also was taken to Advocate Christ Medical Center for treatment of a gunshot wound to his left leg, according to police. He had been listed in good condition.

       No arrests had been made in either case. Check back for updates.

       kdouglas@chicagotribune.com

       Twitter @312BreakingNews

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