PHILADELPHIA -- Police in Philadelphia are looking for at least two people in connection with a deadly playground shooting that killed a basketball league organizer and a teenager and wounded four others.

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Six people were shot around 10:30 p.m. Thursday in West Philadelphia on the 3600 block of Aspen Street in the city's Mantua section.

Darren Hankins, 19, and Miles Mack, 42, were killed, Deputy Police Commissioner Richard Ross said.

Three of the injured -- all men aged 20, 23, and 45 years old -- were hospitalized in critical but stable condition, police said. Another 18-year-old victim was treated and released for a graze wound.

Investigators said they believed Hankins, of North Philadelphia, may have been the target.

The shooting happened at the McAlpin playground during a trophy ceremony for a championship youth basketball game, Ross said.

Mack had been running the basketball league for three years, Ross said.

He started the league in his West Philadelphia neighborhood in 2004 as a way of keeping children out of trouble and, according to the league's Web site, "to provide an alternate outlet to a sometimes dangerous environment."

The league, the Xtra Miles Developmental Basketball League, sought to provide children with positive role models and to help youth live up to their potential, according to the Web site. The Web site notes that, besides basketball equipment, the league provided players with information on college, jobs and drug prevention.

"This was a man who was trying to help people," Ross said.

Police said they believe the shooting had nothing to do with the basketball game.

Ross said two men walked up to the basketball court and fired about 17 shots.

"It was a vicious and cowardly act of violence," Ross said. "Most of the people were shot in the back trying to escape the gunfire."

Mack had worked for 16 years at Thomas Jefferson University Hospital, where he was a transportation aide, moving patients around the hospital in wheelchairs, beds and stretchers, hospital spokesman Rick Cushman said.

"He was a very, very nice guy, very supportive," said Aron Berman, manager of the transportation department. "We're all just very shocked and upset about what's happened. It's a tremendous loss that really hurts us."

Ross said they do not believe Mack was a target. Hankins may have been the target, Ross said.

"These two cowards walk up and obviously they would know these people aren't armed. They obviously aren't armed, they were playing a basketball game, and they began firing." Ross said.

The gunmen then fled the area, police said.

Ross said about 40 to 50 people were at the scene and he hopes someone will come forward with more information.