According to the office, Istanbul police launched an operation in 18 Turkish provinces to detain members, including the director of the humanitarian aid organization “Kimse Yok Mu”, which means “Is anybody there” in English.
Police have so far held 41 members of the organization, the office said, adding that 77 others were abroad.
Two others were arrested for other crimes, while search for the remaining one suspect continues, the office added.
The suspects are accused of being members of an armed terrorist organization, violating terror financing law, laundering of illegally acquired properties and contravening the law of associations.
The organization had in the past several years collected money from people for the Eid al-Adha.