Those held included a brother of Iyad Hardan.
Demonstrations and gatherings have been held, including one in City Hall last month.
It said: "Opposition activists sentenced after unfair trials in previous years continued to be held, including prisoners of conscience.
Those held included the leader of one political party and a former deputy prosecutor-general who backed the protests.
Other dual citizens being held include five British-Iranians and one Lebanese-Iranian, and experts say there may be more.
Those held included a now five-month-old baby who has spent more time in jail than at liberty.
The degrees he held included a master's degree from Union Theological Seminary and a doctorate in education from New York University.
Those being held include people from former Soviet republics with close ties to Russia, like Uzbekistan, Kyrgyzstan and Tajikistan, as well as Syria, Afghanistan and Egypt.
Various stakes are held, including puppy (for dogs not more than 18 months old), derby (not more than 30 months), all-age, shooting dog, and championship events.
