Jamat-ud-Dawa (JuD ) chief Hafiz Saeed was placed under house arrest on Monday by Punjab Home Department, reportedly.
Awan said the police tole them they had an arrest warrant for Saeed and four others at JuD headquarters in the eastern city of Lahore.
Police arrived at the organisation's headquarters in Lahore with orders to place him under house arrest, JuD spokesperson Yahya Mujahid said.
Saeed has been interned at Jamia Qudsia Mosque near Chouburji, which happens to be the headquarter of his terror outfit, Pakistani news channels reported.
Saeed has been detained under Section 11-EEE (1) of the Anti-Terrorism Act, 1977, sources said.
Soon after, JuD activists held a protest at the Press Club of Islamabad to oppose any possible ban on the group.
Saeed is wanted by India and the United States for his alleged role in masterminding the 2008 terror attacks in Mumbai that claimed 166 lives.
During a meeting with Pakistani envoy Jalil Abbbas Jilani on January 11, a U.S. assistant secretary of state raised the issue of the Asia Pacific Group on Money Laundering's latest report raising objections regarding the activities and the financing of the JuD, the report said. Saeed is believed to have organised training sessions of the ten attackers and also wished them luck and waved them off before they set sail for Mumbai near Karachi. "This government has buckled under the pressure". He even carries a bounty of Dollars 10 million (over Rs 66 crore) on his head for his role in the attack.