Police have secured four of the 17 undertrial prisoners who escaped from the Thekkampatti Sub-Jail in Tamil Nadu's Theni district, while an intensive search operation is underway to trace the others. The four secured escapees have been identified as Praveen Kumar, Silambarasan, Rajkumar and Raja Sikander while an intensive search operation remains actively underway across the district's densely forested areas to trace the remaining 13 prisoners. South Zone Inspector General of Police Bidari told NDTV that intensive combing operations were underway in the forested area.