tbilisi former islamic state fighter suspect mastermind deadly attack istanbul airport 2016 kill special operation ex-soviet georgia last week spokeswoman georgia state security service say friday akhmed chatayev name turkish media u.s. congressman mastermind suicide bomb istanbul airport 2016 kill 45 people involvement corroborate turkish officials confirm one kill operation akhmed chatayev nino giorgobiani spokeswoman georgia state security service tell news brief giorgobiani say chatayev blow one georgian special force serviceman two members arm group suspect terrorism kill operation four police officer wound one member group also arrest 20-hour operation take place apartment block outskirts georgian capital tbilisi last week giorgobiani decline name two arm men kill disclose identity member group arrest group motives get georgia investigation ongoing ... continue work international partner identify two arm men giorgobiani say say experts unite state participate investigation unite nations sanction list describe chatayev senior figure islamic state responsible train russian-speaking militants veteran chechnya conflict moscow lose arm live georgia pankisi gorge remote area populate largely people kist community ethnic chechens whose ancestors come mainly christian georgia 1800s collapse soviet union chechnya rise arm rebellion moscow rule kist community draw fight thousands refugees arrive chechnya insurgents use gorge regroup prepare new attack chatayev wound arrest georgia august 2012 follow clash georgian police group militants allegedly try cross georgian-russian border move dagestan georgia say suspect istanbul airport bomb kill last week