The railing separated concertgoers from the stage at the BB&T Pavillion in Camden, New Jersey, located across the Delaware River from Philadelphia.
The incident happened around 10 p.m.
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Officials said all of the injuries appear relatively minor.
The concert was about halfway finished when the railing collapsed. Concert-goer Christina Kinne tells ABC News there was a lot of commotion following the collapse, and the rest of the concert was cancelled.
ABC News' Brendan Rand and Rex Sakamoto contributed to this report.