Attackers kill 4, injure 14 at Turkish state aviation site ReutersTerrorist attack on state-owned Turkish Aerospace Industries kills at least 4 people, official says CBS NewsThree killed, five wounded at attack on Turkish aviation firm, reports of hostages taken The Jerusalem PostTerrorist Attack Hits Major Defense Facility in Turkey The Wall Street JournalAn attack on a key Turkish defense company leaves 4 dead The Associated Press