The shooting happened near 24th and Clifford streets around 4:45 a.m. Saturday.
Police say a man was shot six times at an after-hours club.
Medics rushed the victim to Hahnemann University Hospital for treatment, where he was listed in critical condition.
Meantime, the gunman barricaded himself inside a nearby building.
A SWAT unit arrived on the scene.
Action News was there as the heavily armed officers entered the building just before 6 a.m., but they found no one.
Three people were taken in for questioning after the incident.
On Saturday afternoon, Action News was told a person of interest was being questioned in connection with the case.
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