"Sarah has become victim of political bickering in the country. This shows how deep rifts are within conservative establishment," Hadi Ghaemi of the International Campaign for Human Rights in Iran told ABC News Saturday.
On Aug. 10, the mothers of the hikers made another open plea to Iran's leaders, invoking the sacred time of Ramadan and Shourd's "serious medical condition."
"Sarah has a serious medical condition and we are gravely concerned for her physical and emotional welfare, for which Iran's leaders are responsible. We urgently call on the Iranian authorities to end her isolation and provide her with adequate care," the mothers said in a statement on a website dedicated to the hikers' release.
In an interview with "GMA" in May, Shourd's mother, Nora Shourd, said she wasn't sure what she would do when finally reunited with her daughter.
"I think I'm just going to say ridiculously silly things," Nora Shourd said. "'I'm so glad to see you, sweetie. How are you? I love you.' You know, just ordinary stuff."
At the time, Shourd's mother told "Good Morning America" she was worried about her daughter because Swiss officials had told her the young woman was depressed. At the same time, The Associated Press reported Shourd had a serious gynecological condition.
After the initial reunion with their mothers in May, the three hikers spoke to reporters and described their captivity.
Shourd, who spent a majority of her captivity alone, said the food was "good," and we have medical care, which is appreciated."
Bauer, 28, said the group had a "decent relationship" with the guards, and that "it's been civil."
Fattal, 28, said the officials eventually allowed the Americans to have books while in confinement.
"Once we started getting books that really helped the prison experience a lot," he said.
When news of the release first broke Thursday, the hikers' mothers were cautiously jubilant and released a statement on Facebook.
"We have seen the news reports and are urgently seeking further information," the statement said. "We hope and pray that the reports are true and that this signals the end of all three of our children's long and difficult detention. Shane, Sarah and Josh are all innocent, and we continue to call for their immediate release, so that they can return home together and be reunited with our families."
Just minutes later, the administrator of the Facebook account, a "friend or family" of the hikers, commented on the post and said, "I AM PRAYING!!!! GOD - THANK YOU!!!"
An hour ago, the adminstrator made another post, this time about "longing for" the hikers' release "as we wait and wonder."
ABC News' Jason Stine, Kirit Radia, Sabrina Parise, Thea Trachtenberg and The Associated Press contributed to this report.