HE the Minister of Interior and Commander of Lekhwiya Force Sheikh Khalifa bin Hamad bin Khalifa al-Thani sent a written message to Minister of Interior of Tunisia Kamal Feki pertaining to the field of security co-operation between the two countries. Ambassador of Qatar to Tunisia Saad bin Nasser al-Humaidi delivered the message during his meeting with Minister of Interior of Tunisia Kamal Feki.