DUBROVNIK, Jan 14 (Hina) - The police in Dubrovnik and their colleagues form Bosnia-Herzegovina have carried out an investigation against two Bosnian citizens on suspicion that they killed 55-year-old Mirko Grubisic in Metkovic on Monday. They are suspected of having shot him head and left the crime scene in an BMW. Their car was later found in Kula Norinska. The suspects were in the meantime nabbed in Bosnia.