Police fear a haul of guns stolen in a daytime burglary near Greytown will fall into the hands of gangs and other criminals.
Eleven guns, a mixture of shotguns and rifles, were stolen from a locked gun cabinet at a Morison's Bush house sometime between 10 and 11am on Tuesday.
Head of the Masterton Tactical Crime Unit, Detective Sergeant Dean Cadwallader, said police were worried the guns could be used to commit more crimes.
"Our concern is that criminals or gang members will end up with these weapons and make it unsafe for the public and police, and be used in further offending and the like."
It appeared to be an opportunistic theft and anyone with information should come forward, he said.