Mr Saeed founded Pakistan's Lashkar-e-Taiba (LeT) group, which has been banned since 2002.
Saeed's arrest comes at a time when Pakistan has been under increasing pressure to crack down on militant groups.
Since the Khan government has taken control of the JuD and the FIF properties including seminaries and mosques across the country following worldwide pressure built up after the deadly Pulwama attack, Saeed was keeping a low profile at his Lahore's Jauhar Town residence. The watchdog gave Pakistan an October deadline to improve its efforts against terror financing.
Born in 1948, Hafiz Saeed along with his family started migrating from East Punjab and reached Pakistan in around four months in the autumn of 1947.
Another security official said the arrest relates to terror financing charges.
Reportedly, Saeed was travelling from Lahore to Gujranwala when the arrest took place. Pakistan said Saeed had been cleared by its courts and sought more eveidence from India.
Previously, Mr Saeed had been detained several times, along with some of his close aides, but had not been charged or put on trial.
July Full Moon 2019: 7 Things to Know About the ‘Buck Moon’
Then, on the morning of November 19, 2021, North Americans will be treated to an eclipse covering 98% of the moon's diameter. It will end at approximately 01:17 BST when the Moon exits the Earth's lighter shadow, called the penumbra, RAS said .
Extinction Rebellion activists hold protests across the UK
More than 3,000 protesters turned out in London , Leeds and Bristol in Britain; as well as Cardiff, Wales, and Glasgow, Scotland. Frances, an 18-year-old Extinction Rebellion Youth member protesting in Leeds, said: "We are facing the sixth mass extinction".