Earnest says the United States remains steadfast in its support for Turkey, a NATO ally and partner, "along with all of our friends and allies around the world, as we continue to confront the threat of terrorism."
Turkey's Justice Minister Bekir Bozdag says at least 31 people have been killed and some 147 wounded in the attack on Istanbul's Ataturk airport.
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23:12 Reports: Istanbul nightclub attacker who killed 39 captured13
23:09 Reports: Suspect caught in Istanbul nightclub attack15