Police have arrested six suspects for their alleged involvement in the kidnapping of a Polish engineer and for killing his driver and guards, police sources said on Sunday. The suspects are Khalid Ejaz, Rashid Hussain, Tasawar Hussain and Ikram Saeed, all residents of Pind Sultani, and Habibur Rehman and Akhtar Hussain who hail from Pind Sirhal. The Polish engineer was abducted and his driver and guards killed on September 28.