Two men have been charged following a thwarted attempt to smuggle contraband, including cannabis and cellphones, into Whanganui prison, Corrections say.

In early July a package was intercepted as it came onto prison grounds and two men located outside the prison perimeter were arrested in a joint Corrections and Police operation.

The package was found to contain large quantities of cannabis, tobacco, papers, cellphones and accessories, Corrections said.

Corrections said it was a significant contraband seizure and the interception operation disrupted a serious risk to the prison's safety and security.

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Two men have been jointly charged with possession of cannabis for supply and breach of the Corrections Act for unauthorised deliveries.

One man faces a further charge of possession of a knife.

The men have been remanded in custody and will appear in court at a later date.