The Pakistan authorities arrested Lashkar-e-Taiba (LeT) head Hafiz Saeed.
The militant group is accused by India for an attack on Mumbai in 2008.
He was reportedly arrested in Gujranwala by Punjab Counter-Terrorism Department (CTD).
Saeed was earlier given bail in two cases registered against him in Lahore.
The Counter Terrorism Department said it registered cases under the Anti-Terrorism Act against the leadership of banned outfits Jamat-ud-Dawa (JuD), Lashkar-e-Taiba (LeT) and Falah-e-Insaniyat Foundation (FIF).
The move comes in a major crackdown against terror financing.
23 cases were registered against Hafiz Saeed and 12 aides for using five trusts to funnel funds to terror suspects.
The accused were raising funds for terror financing using trusts — Dawatul Irshad Trust, Moaz Bin Jabal Trust, Al Anfaal Trust, Al Madina Foundation Trust and Alhamd Trust.