Boats illegally fishing for toothfish in the Southern Ocean continue to evade the New Zealand Navy.
A spokesman for Foreign Minister Murray McCully this morning said the navy had not been able to board the ships overnight.
He would not confirm if HMNZS Wellington was continuing to pursue the vessels.
"We're deliberately not saying too much about the operational situation down there at moment."
The navy had been urged to escalate a stand-off with the three illegal fishing vessels, with calls for a show of firepower.
The stand-off intensified yesterday with the two ships refusing to let Defence officials on board.
HMNZS Wellington was given permission overnight Tuesday to board the vessels, which were flagged to Equatorial Guinea and were not legally permitted to fish in the region. But attempts to board them and inspect their catches have so far failed.
New Zealand First defence spokesman Ron Mark said the standoff revealed concerns about rules of engagement and the war-fighting capability of our naval vessels.
"It is clear this needs escalation. Offshore Patrol Vessels (OPV) are armed with a single gyro-stabilised 25mm Bushmaster cannon and two unstabilised .50 calibre machine guns. ... It should be ... sufficient to send a warning shot across the bow.
"Ultimately, New Zealand is exercising our legitimate legal rights and should these vessels refuse boarding then we must be prepared to use force."
Mr McCully said yesterday: "HMNZS Wellington attempted to exercise its legitimate right to board the Yongding and the Songhua ... but the vessels refused to co-operate."
Equatorial Guinea told New Zealand officials it was believed the vessels were fishing illegally and agreed the Navy should board them and verify their flag status.
