The Special Cell of the Delhi Police, which is probing the cases of violence in northeast Delhi, has arrested Popular Front of India (PFI) president and secretary. The office-bearers of PFI, president Mohammad Parvez Ahmed and secretary Mohammad Ilyas, were on Thursday arrested for questioning, sources in the Delhi Police said. The two members of the PFI were reportedly taken into custody on charges of hatching a conspiracy to incite riots in northeast Delhi.