A two metre long shark has been spotted near a popular swimming area in Wellington Harbour this morning.

It's thought to be a blue shark, and has been circling the diving platform on Taranaki Wharf near Te Papa Museum.

A sign has been put up warning people against swimming in the area as it may be dangerous.

It's the same kind of shark that was seen on multiple occasions swimming in Frank Kitts Lagoon in the habour in January.