Family and friends, none of whom wanted to give their names, circled the north end of the scene, marked by yellow tape hung around trees, light poles and cop cars.

A young man at the scene who refused to give his name but said he saw the shooting called the gun used a "big boy."

"Look at that (bullet) hole," the young man said, motioning to the passenger side door on the van. "That's a full nickel."

An east-facing car sat abandoned in the T intersection formed by Mozart and Fillmore. Police weren't sure whether the people who abandoned the car were involved in the shooting or freaked out and fled the scene. Police found casings from two weapons – one a rifle – whose bullets had entered the van from both sides.

"He was gangsta with his (expletive)," the man said of the individual or individuals who did the shooting. "He knew what he was doing."

Despite his apparent proximity to the attack, he explained to a detective that he could not help police do their jobs. He later complained to a supervisor about their response time – he said 27 minutes but police said 3. Police said that they received one 911 call about shots being fired in the area.

A 16-year-old boy who said he was with the victims when the shooting happened wandered around the lot, looking toward the ground most of the time. He looked emotionally spent after being held by police for a short time at the scene.

"I just want to go home," he said, though he had no ride home. "It just happened so fast. I'm tired of explaining myself."

In another fatal overnight shooting, three men were shot about 4 a.m. outside of a diner at the corner of Wallace Street and Pershing Road in the Bridgeport neighborhood on the South Side, police said. Two men died at the scene.

pnickeas@tribune.com

Twitter: @PeterNickeas