New Zealanders will almost certainly be named in material still to come from the Panama Papers, a New Zealander involved with its publication says.

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The papers published in the past week show how a Panamanian law firm Mossack Fonseca created shell companies for financiers, drug kings, terrorists and politicians to evade tax.

Peter Bale is chief executive of the Washington-based Center for Public Integrity which published the leaked documents.

He told TV3's The Nation that there were more documents to come but said the data needed more study before it could be released.