A major police operation resulting in at least 30 arrests is likely to stymie Australian gang the Rebels' growing presence in NZ, police say.

Luxury cars and motorbikes, drugs and thousands of dollars have been seized in a major police crackdown on organised crime.

A major police operation today has highlighted the fact that rival gangs are working together in the highly lucrative drugs trade, Police Minister Judith Collins says.

Anonymous tipsters responding to an appeal for information on a vandalism attack have given police new leads on the murder of Feilding farmer Scott Guy and police have reiterated that information will be treated in confidence.

Police investigating the murder of farmer Scott Guy are pursuing a new lead linked to a vandalism attack on his Feilding property.

Members of the public wept in court today upon hearing a 3-year-old had over 80 marks or wounds when she died.

Police are warning users of the Whanganui River to beware of a shark that has been spotted in the river.

A police search and rescue team looking for missing Pahiatua man John Campbell have found a body. Mr Campbell, 64, was last seen leaving his Pahiatua home, in the Tararua district, for work at 6.45am yesterday.

Convicted murderer Stephen Hudson has filed private prosecutions against witnesses who gave evidence against him.

The National Government and its Maori Party partners presented a united face when Prime Minister John Key visited Ratana Pa this afternoon - a move Mr Key admitted was unexpected.

Phil Goff believes Ratana church followers are rallying behind Labour because of wider problems they see in NZ.

Maori party co-leader Tariana Turia says she is "totally unaware" of any leadership aspirations rogue MP Hone Harawira may have.