A prisoner has received further jail time for obstructing a prison officer who was trying to deal with an incident.

Patrick Domanic Waretini pleaded guilty to assaulting a prison officer when he appeared in the Whanganui District Court on Tuesday.

On June 22 Waretini held the vest of a prison officer who was trying to deal to an incident.

His lawyer Anna Brosnahan said he had immediately pleaded guilty.

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"It is simply the defendant trying to hold the prison officer back."

Judge Philip Crayton sentenced Waretini to four weeks imprisonment.