Just what’s going bang in the night?

The source of mysterious loud ‘‘bangs’’ in an urban neighbourhood is still a mystery.

An unexplained noise has been heard in the Hillsborough-Onehunga area towards Mangere, and has been described by residents as a loud explosion.

Residents have been abuzz with curiosity month trying answer.

Inquiries with police, the Onehunga Port, power companies, Geonet and nearby recycling plants have not revealed the direction or source.

Hillsborough resident Mike Buxton says the noise made him and a neighbour go outside one evening to for the past to find an check what ‘‘explosion’’.

‘‘We both thought it sounded like a bomb blast sound,’’ he says.

Judy Choy, from Onehunga, says she thinks the noise could come from a vehicle.

‘‘This could be from a white car that goes around the neighbourhood with a loud boom box and also

caused

the occasionally backfires making the loud explosion noise,’’ she says.

‘‘This car has been around Onehunga for a while.’’

Resident Cuni de Graaf says the noise could come from ‘‘hoons’’ using heavy duty fireworks at Hillsborough cemetery.

‘‘But normal fireworks are not that loud, powerful and penetrating.

‘‘Then I wondered if the high pressure gas pipeline under our road had exploded not far away. But that was not the case.’’

Another reader thinks the noise is from stock cars at Waikaraka Park and the fireworks afterwards.

Reports of the noise being heard in the early morning have left residents even more puzzled.