Islamabad, July 27 - Pakistan's Interior Minister Rehman Malik has constituted a committee to investigate the cases against pro-Taliban cleric Maulana Sufi Muhammad who was arrested Sunday in northwestern Peshawar City, the Online news agency reported.

Sufi Muhammad is the father-in-law of Maulana Fazlullah, head of the Taliban in Swat Valley, and headed the banned Tehrik-e-Nifaz-e-Shariah Muhammadi (TNSM).

The security forces also detained the cleric's two sons, Ziaullah and Rizwanullah, in a raid in Peshawar City.

The special joint committee will comprise officials from the federal and provincial security agencies, the report said.