islamabad bomb blast kill pakistani army officer three soldier search kidnappers free u.s.-canadian family tribal region border afghanistan pakistani u.s. officials say pakistan army say attack kurram tribal district sunday also wound three soldier search hold american caitlan coleman canadian husband joshua boyle three children hostage family free wednesday pakistani army shoot tire vehicle carry family rescue base intelligence share u.s. authorities local government official base khan say improvise explosive device explode military bomb disposal squad scan route two bomb go army team reach site pakistani taliban claim responsibility personnel search kidnappers u.s. citizen family say david hale u.s. ambassador pakistan statement remain extremely grateful pakistani military quick response successful humanitarian operation allow caitlan coleman family return home safely family rescue hail u.s. president donald trump positive moment u.s.-pakistan relations fray recent years amid washington assertions islamabad enough tackle taliban-linked haqqani militants believe pakistani soil coleman boyle hold haqqani militants kidnap backpack afghanistan 2012. pakistani army indicate captors track shortly enter afghanistan although remain unclear whether family keep afghanistan five years pakistan time haqqani militants term u.s. general veritable arm pakistan top spy agency inter service intelligence isi operate side long porous border boyle video statement release pakistani military call captors criminals pagans nothing islam boyle describe operation free family incredibly professional see truth truth car riddle bullets say isi army get criminals car make sure prisoners safe family safe bomb kill pakistani soldier hunt u.s.-canadian family 's kidnappers