A crash involving four vehicles has been causing traffic congestion on Auckland's Harbour Bridge this morning.

A police spokesperson said the crash happened at 10.43am near the Stafford Rd off-ramp and involved two nose-to-tail collisions that happened at the same time.

No one was injured.

The crash caused traffic to back up as the vehicles were stopped on the northern side of the harbour bridge median.

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The NZ Transport Agency reported that all vehicles had now been cleared, but some delays could be expected as the congestion eased.