A plume of smoke seen rising above Long Bay Beach, Auckland’s North Shore. Photo / Supplied

An “item of concern” detonated by the Defence Force was behind a loud explosion followed by a plume of smoke at a beach on Auckland’s North Shore.

The item of concern found at Long Bay Beach this morning was later found to be a marine marker flare.

A New
Zealand Defence Force (NZDF) spokesperson told the Herald that the Defence Force explosive ordnance disposal team responded to a police request for help.