Traffic is now flowing freely after a six-car crash brought traffic to a halt on the Auckland Harbour bridge.

The crash happened before 6.30pm near the Shelly Beach Rd off-ramp southbound.

NZTA spokeswoman Sarah Azam said the crash was cleared at 8pm, but there was congestion all the way back to Northcote Rd.

A police spokesman said no one was injured in the crash, and it was too early to tell what had caused it.

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Southbound traffic backed up to Onewa Rd following a crash on the Harbour Bridge. photo / NZTA
Southbound traffic backed up to Onewa Rd following a crash on the Harbour Bridge. photo / NZTA

People took to social media to warn others of the crash.