Red Cross worker Louisa Akavi, a New Zealand national, is seen in this undated handout photo released by the International Committee of the Red Cross (ICRC), April 14 2019. ICRC/HANDOUT

Wellington, New Zealand -- New Zealand's foreign minister confirmed Monday that a New Zealand nurse has been held captive by ISIS militants in Syria for almost six years, information long kept secret for fear her life might be at risk. The status of nurse and midwife Louisa Akavi, now 62, is unknown, but her employer, the International Committee of the Red Cross, says it has received recent eyewitness reports suggesting she might be alive.

The New York Times on Sunday became the first media organization to name Akavi, ending a more than 5 ½-year news blackout imposed by New Zealand's government and the Red Cross with the cooperation of international media.

The collapse of the Islamic State of Iraq and Syria (ISIS) has raised hopes that Akavi and the two Syrian drivers kidnapped with her might now be discovered.

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In a statement, the ICRC said that as recently as December, Akavi may have been seen by at lest two people at a clinic in Sousa, one of ISIS's last outposts. There were also reported sightings in 2016 and 2017, Red Cross officials said.

"We continue to work together (with the Red Cross) to locate and recover her," New Zealand Foreign Minister Winston Peters said. "This has been a uniquely complex and difficult case. "Louisa went to Syria with the ICRC to deliver humanitarian relief to people suffering as a result of a brutal civil war and ISIS occupation."

"Where a New Zealander is held by a terrorist organization, the government takes all appropriate action to recover them. That is exactly what we have done here," Peters said.

Peters said New Zealand had sent a small multi-agency team, including special forces, to Iraq to gather information on Akavi.

"This has involved members of the New Zealand Defense Force, drawn from the Special Operations Force, and personnel have visited Syria from time to time as required," he said. "This noncombat team was specifically focused on locating Louisa and identifying opportunities to recover her."

Akavi was taken captive in 2013 in the city of Idlib in northwest Syria. It is believed she was offered for ransom and may have been used as a human shield. New Zealand's government believed at one point that she may have died. But there are hopes her medical skills might have caused her captors to spare her.

Akavi's family said they miss her and are proud of the work to which she's dedicated her life.

"We think about her every day and hope she feels that and finds strength in that," said a video statement issued by family spokesman Tuaine Robati. "We know she is thinking of us and that she will be worried about us too."

New Zealand's government is reported to have opposed the ICRC's decision to allow The New York Times to report Akavi's name and nationality.

At a news conference Monday, Prime Minister Jacinda Ardern refused to answer questions about Akavi but indicated she was disappointed the ICRC had gone public before her fate had been learned.

"You'll forgive me, I hope, for not commenting on that case," Ardern said. "It remains the government's view that it would be preferable if the case was not in the public domain."

Dominik Stillhart, director of operations for the ICRC, said the organization had decided to permit publication in the hope it would elicit new information on her whereabouts.

"We have not spoken publicly before today because from the moment Louisa and the others were kidnapped, every decision we made was to maximize the chances of winning their freedom," Stillhart said in a statement. "With Islamic State group having lost the last of its territory, we felt it was now time to speak out."