The gunman began arguing with his girlfriend outside the store and then followed her inside, according to Lt. Frank Vanore. He followed her through the store and back to the loading dock, where he pulled out a handgun and opened fire, striking another employee who intervened, according to police.
Officers fanned out around the northeast Philadelphia store in search of the alleged gunman, identified by police as Daryl Anthony Birch, 30. A telephone listing for Birch could not immediately be located by The Associated Press.
Police were turning away customers at the door of the store and investigators could be seen talking to people inside.
Kim Freely, a Chicago-based Kmart spokeswoman, declined to comment.
Two elementary schools, one of them several blocks from the scene, were locked down after the shooting, said Fernando Gallardo, a spokesman for the city school district.
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