By Elizabeth Hur, Andrew Kramer, Jenn Bernstein

PHILADELPHIA (CBS) — Authorities say one person is dead and another is in critical condition after six total people were shot Sunday evening in the Kingsessing section of Philadelphia.

The shooting happened around 7 p.m. at 54th Street and Florence Avenue just outside a deli.

Sources say a man walked up to the corner and just started shooting. A car believed to be with the shooter also pulled up on the opposite side of the group, almost boxing the victims in, and also began firing.

The first victim was pronounced dead on the scene, while the other victims were rushed to area hospitals for treatment. One of them is said to be in critical condition while the other four are stable.

None of the victims have been identified, but police say their ages range from 18 to 23 years old. All the victims are male.

Police say despite the large crowd out at the time of the shooting, so far no one claims to have seen or heard anything.

Police Commissioner Charles Ramsey said Monday morning that detectives will look to see if Sunday night’s shooting is retaliation from a previous murder in the area.

“There was a homicide there in late September, at least in that area. We don’t know if any of the victims were alleged to have been a part of that, if that had something to do with it, or if this is a different kind of dispute.”

Police say they don’t have any suspects identified.

The shooting remains under investigation.