"All NATO allies stand united in the fight against the scourge of terrorism," Stoltenberg said.
German Chancellor Angela Merkel also expressed "dismay" over the deadly attack, calling it an assault on "civic rights, democracy and peace".
"If the indications of terrorist attacks are confirmed, then it's a matter of particularly cowardly acts, which are directed straight at civic rights, democracy and peace," Merkel said in a condolence message to Turkish Prime Minister Ahmet Davutoglu.
Merkel also said she was "convinced" the Turkish government and all of Turkish society stood united at this moment and would "contrast terror with a response of closeness and democracy".
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