Four killed, 14 injured in terror attack on Turkish aerospace company CNNAttackers kill 4, injure 14 at Turkish state aviation site ReutersTerrorist Attack Hits Major Defense Facility in Turkey The Wall Street JournalAn attack on a key Turkish defense company leaves 4 dead The Associated PressDeadly ‘Terrorist Attack’ on Turkish Aerospace Company Leaves 4 Dead and 14 Injured The New York Times