An unidentified item has been taken away by the New Zealand Defence Force's Explosive Ordnance Disposal team after a callout on Tuesday night.

Police attended a callout to the Newton Road Overbridge in Eden Terrace, a suburb of Auckland, following reports of an item of concern.

Police CIB staff would make inquiries to identify the small object and ascertain why it was left on the overbridge, a police spokesman said.

Jonathan Sweeney said he rode past the item in question while on his bike at 5.50pm.

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"It appeared to be a car battery on fire.

"It was spitting out sparks as I rode past and people were keeping their distance."

Police along with the Fire Service attended the call out.

Police have now left the scene.