A statue of Antarctic explorer Captain Robert Falcon Scott was left hanging, after vandals snapped off his walking pole.
The statue had only been re-erected little more than three weeks ago - it was repaired after it fell from its plinth in the February 22, 2011 earthquakes.
The thin brass pole was found snapped into two bits on Monday, but the Christchurch City Council says the round basket fitting is still missing and they want it back.
"It is possible that whoever vandalised the statue took it as a souvenir or that they tossed it into the river," says council acting head of parks Brent Smith.
"Years of work went into repairing the statue after the earthquakes, and to have it attacked so mindlessly by vandals is distressing for all those involved in the project and for the Scott family."
The statue honours the life of the polar explorer and those who lost their lives on a return journey from the South Pole in 1912.
Mr Smith urges anyone with information about the vandalism to contact the council.