Hong Kong Police have helped New Zealand officers crack a transnational drug syndicate, in an operation that saw 95kgs of 'ice' worth $650 million seized, and two Hong Kong people arrested.

The syndicate has been under investigation since January, and the operation turned overt this week. Officers searched two containers in Auckland and seized the 'ice' plus another 150kgs of pseudo ephedrine, the main ingredient for manufacturing the drug.

Six guns, an assault rifle and a large amount of cash were also seized at another location. Six men, including two Hong Kong residents, were arrested. They were charged with drug and firearm offences and appeared in a New Zealand court today.

Several locations in Hong Kong were raided but no arrests were made.