The incident took place about 3 a.m. Sunday at Ed's Car Wash in Melcroft, Pennsylvania, about 50 miles southeast of Pittsburgh, police told WXPI News.
Four of the victims were pronounced dead at the scene, while another died at a hospital, the news station reported.
Police have not released the names of the victims yet.
It was not immediately clear whether the shooter was among the dead, but authorities told local media outlets there was "no threat to the community, no imminent danger."
Details were scarce Sunday, as police and other emergency vehicles swarmed the tiny car wash throughout the morning. By Sunday afternoon, the question of what sparked the shooting was still unanswered.
"There is no indication of drug activity at this point," Pennsylvania State Police spokesman Robert Broadwater told the Pittsburgh News-Gazette. "But we have no motive, no reason."
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Broadwater also told the newspaper that two of the victims were discovered inside a green pickup truck, while two others were found dead outside in the car wash parking lot.(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
