The Syrian Network for Human Rights said that it has documented the release of 193 detainees since May 1, including 7 who were children at the time of their arrest.
The released detainees spent from 2 to 8 years in detention.
According to the network, although "the release of detainees from the horrific prisons of the Syrian government is good news", no information has been provided about many of those still detained.
She added that photos published over the past few days show crowds of people gathered under the President's Bridge in Damascus, anxiously awaiting the arrival of their potential loved ones.
Many of these families have seen their relatives' names on lists posted on social media, while others have come hoping to see a recognizable face.
The head of the "Terrorism Court" in Syria, Zahira al-Bishmani, later confirmed that these lists were untrue, and described the gatherings of families as a "surprising case."
She said amnesties will be granted on a case-by-case basis, the government will not provide any comprehensive lists nor specify specific release locations, and releases will occur in "batches".
The organization concluded that the chaos around these limited releases was heartbreaking for many families who searched unsuccessfully for information on their relatives held for years.
It noted that tens of thousands of people are still being detained or forcibly disappeared by the Syrian government.
On April 30, Syrian President Bashar al-Assad issued a general amnesty for "terrorist crimes committed by Syrians", with the exception of crimes that led to the death of a human being.