Crowd control railing at a Snoop Dogg concert in Camden, New Jersey, has collapsed, injuring spectators.

Local media reports at least five people were taken to hospital after more than a dozen tumbled on to concrete as the Snoop Dogg and Wiz Khalifa concert was underway about 10pm local time.

The BB&T Pavilion's organisers then cancelled the event.

Witnesses have told local media people had been pressed up against the railing that was separating a lawned area from organised seating in a covered portion of the concert pavilion when it gave way.

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A triage centre was set up in a nearby carpark, with more than 20 people attending. Five were taken to hospital.