An investigation is underway after a tack was found in a blueberry in Papamoa.

A local man posted to social media to warn others when he discovered the foreign item.

'Just pulled a thumbtack out of my mouth after eating a blueberry brought from Pak'n Save Papamoa,” says the man's post.

He immediately contacted staff at Papamoa, who offered him a refund.

'I talked to their produce manager and they are pulling all the stock and starting an investigation.”

A Foodstuffs spokesperson says if any customer has a problem with any product they have purchased, they should contact the team instore in the first instance.

'Clearly our store team was concerned and swung into action; implementing our stringent procedures to investigate the issue.

"This included pulling the remainder of the batch from shelves. The outcome of the investigation will be made available to the authorities for their review and support.

"We take any type of issue like this very seriously as food safety is a top priority.”

This is the third time a foreign object has been found in a fruit or vegetable in Tauranga.

Last year a needle was found in a strawberry bought from Pak'n Save in Tauranga, while another needle was discovered in a capsicum bought from a Countdown store.