New Zealand has condemned the "provocative" attacks on oil tankers in the Gulf of Oman and expressed "on-going and deep concern", but stopped short of blaming Iran.
Both the United States and the United Kingdom have accused Iran of being behind the explosions, an allegation Tehran denies.
In a statement, Foreign Minister Winston Peters said the attacks were "dramatically raising tensions in the region" and could have wider consequences.
"The safety and security of international waters is of great importance to all trading nations," Mr Peters said.
"At this time, any misstep or a miscalculation could lead to a serious escalation."
New Zealand called on all parties involved to exercise "caution, restraint and common-sense" and to avoid steps that could undermine peace and security, Mr Peters said.