The government has taken into custody all family members of Maulana Fazlullah, Interior Minister Rehman Malik has said.
Fazlullah has been leading insurgency against the security forces in Swat for two years, which has claimed lives of hundreds of people.
More than 100 cases including murder and attempt to murder had been registered against the militant leader who is currently in hiding.
Meanwhile, the arrested spokesman of Tehreek-e-Taliban Pakistan (TTP) Maulvi Omar Tuesday confirmed the killing of Taliban chief Baitullah Mehsud in a US drone attack.
Baitullah Mehsud was reportedly killed during the US drone missile strike Aug 5.