Lillie Turner was lacing up her shoes about noon Tuesday, ready to push open the door of her East Garfield Park home to get the mail, when she fell to the ground in pain. Her daughter, who lives next door and was over watching TV, told her mother to stay down and dropped to the floor herself as more gunshots sounded.

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Turner, 65, was hit in her left leg below the kneecap. Blood spilling from Turner’s limb pooled on the wooden floor as they waited for paramedics.

But the women didn’t know the extent of the violence — or realize the intended targets — until they got into the ambulance and saw two teenage boys lying in the grass in front Turner’s gate, both shot in the head. The boys, both 16-year-olds …