Federal Interior Minister Rehman Malik said operation in northern areas will lasts till the elimination of last terrorist. Talking to media after reaching back home from US, Malik said 700 militants have been killed and 20 security personnel martyred and 20 injured so far in Malakand operation. He said Pak made an aid appeal to international community for the affectees of Swat operation. Our top priority is to rehabilitate displaced persons. Replying to a question about Dr. Aafia Siddiqui, interior minister said he does not know how Dr. Aafia reached Afghanistan. Pak Ambassador to US Hussain Haqani had requested the US official to send Dr. Aafia back home. He said joint surveillance of Pak-Afghan border and formation of joint force is not possible.