(CNN) -- Family members and friends of an Al Jazeera journalist detained last week in Syria were relieved when news of her whereabouts surfaced Wednesday, but they now have concerns as to when she will be released.
The Syrian government acknowledged holding Dorothy Parvaz, a reporter with the Al Jazeera English network, who had gone missing after arriving in Damascus on Friday to cover the ongoing unrest in Syria, the network said.
But Syrian officials later said that the 39-year-old journalist had been flown to the Iranian capital on May 1 after entering Syria on an expired passport and with "tourism" as her declared reason for travel, according to a statement from the Syrian Embassy in Washington.
Authorities say they searched Parvaz and discovered a large sum of undeclared Syrian currency in cash, along with transmitting equipment.
She was then was escorted by the Iranian Consul to Caspian Airlines flight 7905 enroute to Iran, her country of origin.
"It is very regretful that a journalist working for a world-renowned news agency such as Aljazeera International would attempt to enter a country on two illegal accounts: an expired passport, and by providing false information on official documents regarding her travel reason," the statement said. "It is even more troubling if her employer was aware of, and condoned, this illegal activity, accepting to send her into such harm's way."
But on Monday, Iranian Foreign Minister Ali Akbar Salehi expressed his concerns regarding her detention to state-run TV, IRIB.
"I hope that it is not true, but if that is the case, then we demand the government of Syria to look into this," said Salehi.
Al Jazeera said in a written statement that the network is "worried about Dorothy's welfare, security and safety."
"Syria should release her immediately," the network said.
Meanwhile, Parvaz's family members said they have had no direct contact with her since she disembarked from a Qatar Airways flight in Damascus last Friday.
"We're thankful for the official confirmation, it's a good first step which now allows U.S., Canadians and Iranian officials to take further action," said Todd Barker, Parvaz's fiance, of Luxembourg.
"We trust that they will be treating her with the respect that she deserves," said her father, Firouz Parvaz of Vancouver, Canada.
Parvaz holds U.S., Canadian and Iranian citizenship and has worked for Al Jazeera since 2010.
Kristen Young, a friend and former colleague with Parvaz at the Seattle Post-Intelligencer, said Parvaz had recently returned from reporting on the aftermath of the earthquake in Japan and had covered political strife in Iran.
Thousands of supporters from around the world have started a social media campaign on Facebook, "Free Dorothy Parvaz" and Twitter #FreeDorothy in an effort to draw attention to her disappearance.
"It's such a horrible situation, all you can do is take action," Young said."E-mail everyone you know, call everyone you know, put it on Facebook."
Syria has been roiled for six weeks by anti-government protests and has largely prevented foreign journalists from covering the unrest.
Media organizations have been relying on social media, eyewitness accounts and cell-phone video to report the story.
Dozens of international journalists have been detained and expelled from Syria since March 15, when anti-government protests began, said Mohamed Abdel Dayem, program coordinator for the Committee to Protect Journalists in the Middle East and North Africa.
Syria, according to the committee, has always been one of the worst countries in the region for local and international reporters. Dayhem called Syria's admission that it was holding Parvaz a positive development.
"The announcement that they are indeed holding any given journalist is usually a precursor to them being released and expelled. Those two things always go hand in hand. Every [international] journalist who has been detained since March 15, once they are released, they are expelled," said Dayem.
Dayem said a regime already restrictive of press freedoms has turned increasingly repressive.
"Syria has always been one of the worst countries in the region for local and international reporters. A bad situation has only gotten worse."
CNN's Reza Sayah and Talia Kayali contributed to this report